I recreated the base for this cheap boa system, https://www.amazon.com/dp/B0FCSDYJV3. I have no affiliation to this product, I just happened to choose it as a cheap system to experiment with. The base should work with other similar knock off boa systems since many of them are identical and just rebranded.

This is a simplified plain version of the one I created to attach the lacing system to a knee brace. I will be creating bases for true boa systems in the near future.