They don’t meet main requirement - 2xCR compability. You have 0.8-0.9v per cell when it is empty. They are not so cheap that you can trough away 50% full cells.

I think BLF is suitable place for such posts. Here you can meet crazy modders who change boost-buck driver in their zebralight to FET one. So, you just need to make a post in wtb thread and find some of this brand 2x-cr compatible drivers (hope they were not recycled and somebody have saved one for you).