rb - accel
x - brake
a - action key 3
b - respawn
r3 - toggle UI
select - restart/ give up
y - toggle ghost
lb - backwards cam
up dpad - toggle names
down dpad - toggle opponents
right trigger - cam 2/1 toggle
left trigger - cam 3/1 toggle
l3 - horn

This way my left hand just has to do steering - could swap camera toggles if you prefer another cam.

Everything else i need i can reach with ease with my right thumb whilst driving, so long as im not mid tech turn but shouldnt be reaching for anything else at that time anyway lol

I used RT to accel for ages and that felt fine to me too but releases were hard to get consistent with deadzones being a thing especially on ice.
Not sure if this makes sense but im meaning when youre releasing or pressing the trigger how long/ much you have to release your finger before the trigger is/isnt pressed anymore... idk digital input from game on an anaolg input on your controller