LeftCoastNurd said:
most all v-brake levers are setup for 2-finger....
Avid's Single Digit series of brakes is meant for one-finger operation, if it helps. Or ones like the Avid Speed Dial which are fairly adjustable for the response you want out of them vs the brakes you have.
There are also integrated lever/triggershifters, that might help solve the fit problem of those two.
For the throttle, there are a few solutions, including trigger throttles, or moving it to the left side, etc.
There's several threads about handlebar control setups, some of which are in this list:
https://endless-sphere.com/forums/search.php?keywords=handlebar*&terms=all&author=&sc=1&sf=titleonly&sr=topics&sk=t&sd=d&st=0&ch=300&t=0&submit=Search
or this
https://endless-sphere.com/forums/search.php?keywords=throttle+brake+shifter&terms=all&author=&sc=1&sf=titleonly&sr=topics&sk=t&sd=d&st=0&ch=300&t=0&submit=Search
or this
https://endless-sphere.com/forums/search.php?keywords=throttle*+shift*&terms=all&author=&sc=1&sf=titleonly&sr=topics&sk=t&sd=d&st=0&ch=300&t=0&submit=Search
Probably some here, too, but lots of irrelevant stuff
https://endless-sphere.com/forums/search.php?keywords=throttle+brake*+shifter*&terms=all&author=&sc=1&sf=firstpost&sr=topics&sk=t&sd=d&st=0&ch=300&t=0&submit=Search