I am having a smilier problem, trying to get my Dualsense working my Mac as well. I have managed to manual map buttons to the correctly. Unfortunately I haven't had time to figure out the D-pad, Up & left Right analog stick, L3 & R3. But here is what have been able to figure out so far if some want to keep working it.
Alias {127,127,127,127,39,38,36,37,99,127,127,98,9,8,7,6,4,2,127,5,3,127,1,0}
127 = unbound key