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The lower dan tien, and middle dan tien are very different in nature. In qigong , there are 'three' dan tiens. The experience in focusing on one, is different than the experience of focus on another. The middle dan tien, is very multi dimensional. What one can find in the heart, is very different than the lower. Focusing on both, or seeing that, if I do that, doesn't put me deeply in either. I get a different view of self, in a more generalized/combined reference. It is an interesting question you pose, but,perhaps, not being a 'master', it is one that loses validity quickly! The exercises are given in a 'way'.
The way comes from a master, and master's masters. If you haven't mastered it, questions like this are more an intellectual exercise. It is best to follow the lead given you by a master.
The lower dan tien , for instance , specifically relates to the 'physical' body.
That energy center, and work done there, translates to physical self healing, or in the case of martial arts focus there, energetically enhancing physical power. Now when you get to the middle dan tien and level II, you start to engage with a center of a very different quality. It isn't just an 'image' of focus. Level II practice, is a channelling of energy, through a center of emotional feeling. An potential act of loving, to put it one way. Also, you are projecting this quality of energy(intention again) through your sword fingers, and thunder palms. This additional focus, other than the 'experience' of heart center and the depth within that center, is alot. More than I can fathom at this point , in the sense of full discovery of what lies within that center. Many traditional practices that focus just on enlightenment,for instance, often move through or into the heart as a 'realm' to start one's path with that intent.
It is different say, to see a picture of two hills in a landscape, rather than to actually go and stand on top of one. When I view myself as you suggest, I just get a picture, I don't go into these centers to the same depth, as singular focus. Not to say , at some level of practice, that there isn't something valid, to what you've said relative to some possible practice. I don't think you can envision 'two' energy centers, and clearly experience their qualities and make the connections, so to speak, regarding their different natures. Likewise, there is much feeling to explore in the relationship of middle dan tien focus, and the channelling of both spiritual(ohm) and universal energy, through that center. As you do that, you are also tapping an energy center of love and compassion. There is a great depth of experience within that center.

There is more to the practice, than just making an image of one or both centers, and seeing that, and infusing it with energy.

My personal preference in having practiced SFQ in a sequental way from the beginning through the four levels, is that the transition from Level I, with focus on the lower, and then doing level II, moving to the middle, made alot of sense. Although you can do level II in the lower, it greatly changes the nature of the exercise. Thunderpalms, for instance could be found practiced in even a martial context. The focus, would be on the lower dan tien. At that point of focus, it becomes an energetic exercise, relative to one's physical body(not to mention a shift in intention). This can have, of course, great value too, and if I was practicing level II, and feeling need of addressing the physical aspect of self, I might move it there. My intention, even though I move it there, does not make it martial though. This is relative to one's more specific intention. In SFQ practice, my intention would be to help my physical body if I moved it there in Level II active, not necessarily to develop a powerful palm strike or strength of presence, in putting my palm(arm) out, in martial context. Personally, I can't imagine doing 10,000 hands , with focus on other than my heart center. It is such a powerful 'spiritual' exercise that for me, makes most sense grounded in my heart.
So you work with these centers, relative to purpose, or one's intention too.
One other point. Five element theorey, prevades SFQ. The heart, is king, even in that theory involving the five primary organs,organ systems, heart included. The heart has an effect on the total of this. One can, through the heart, take care of the body, from this perspective. In SFQ, for instance, you have the smile, that is so important. Happiness, or heartfelt joy, heals the physical body. A relationship between middle dan tien, and physical body. Also, the act of helping others heal, as a priority to helping oneself, greases the wheels of one's own self healing, when one's focus turns there. Another relationship between two aspects of selfwork and energy centers.
Creativity is a good thing, and you should look at possibilities within your practice, but it is best to contain that within the context of what is presented for you to do. If you stay on that path, it takes you 'more directly', to a good end result.
love,
gallen