Im not familiar with that board.
As for my 2 combat sticks(gameport versions), I modded them over a year ago with the Pro Micro boards and totally rewired, added buttons and reworked the hats and buttons on the main grip.
I modded the 2nd stick for space sims, converted the combat stick for a left hand grip(lots of works).

They work great but recently had an axis pot of the left stick go bad, it was reading really weird. Cleaned them, checked connections and even tested it totally by itself and still same results. Luckily when I contacted CH about pots last year she sent me 3 brand new ones.
So its the reason I thought about doing a Hall sensor conversion. I have no doubts I can do it, but I'd rather not hack at the gimbals that way if something didnt work out I can just drop the original pots back in.

To bad I cant get my hands on 4 dead CH pots. I have looked at one of my bad ones and I think I could build the hall sensor inside of a gutted and modded pot, at least in my head I think It will work.