I’m clearly a noob so please educate me if I’m wrong. Isn’t what you are doing essentially the same as what has been done with the BLF A6 group buy? As I understand the driver over there it is a combo single 7135 and an FET (from the title of the thread: BLF A6 FET+7135 Light). An ATTiny running ToyKeepers custom (but open source and published) firmware controls them.
BLF A6 GB thread
I totally get it if you want to roll your own, I’m just trying to understand how (or if) what you want to do is different.
Lazy-R-us