My new found threshold breakthrough tool is homeopathy.
My understanding of how it works similarly to holosync is that when we have something in our day to day lives that aggravates insiduously and subtly without our awareness, homeopathy treats this by making us more aware of this aggravation and by making us aware we can release it, it just sounds a little like a holosync experience.
Flower essences can be used. The Bach remedies are one example of flower essences. I know the benefits aren't really the same as holosync.