Could really use some advice. Buddy suffer's from carpatunnel / hands fall asleep.

Its reslly a very simple surgery. There cut the transverse ligament which really serves no purpose. I would highly recommend the surgery as if he keeps going and gets nerve damage his hand may fall asleep for no reason and you cant fix it. Mine was so bad i could ride hard for 15 min and then not be able to feel the clutch/brake. Now i do entire 80 mile enduros full of whoops and no issues.

Had a similar thing as your friends. We were instructed to stretch our wrists any chance throughout the day. I sold soda and all we did was fingertips on a table, steering wheel, door frame basically any stationery object, and flex the wrist slowly applying pressure for 15 or so seconds at a time. Seems too simple to work but over about a week or so of staying on it 25 or 30 times a day it worked. Strength came back and the numbness and tingling went away.
Cheaper than surgery.

You can always get surgery, but it's better to try other stuff first
Wear wrist braces at night to keep your wrist straight
Squeeze with you knees to hold on
Lean into the bars, open your hands on the way into corners
I run Renthal full diamond soft grips too
All helps me

Here's the Vital test of the Mobius brace:
https://www.vitalmx.com/product/guide/Ankle-Wrist-Protection,39/Mobius/…

I never thought of it as an arm pump solution, but with carpal tunnel or if you have bad wrists your grip is definitely affecting your forearms.

Carpal tunnel procedures are easy. Small incision. Quick snip.

Regional blockade no general anesthesia. Do non dominate ha mind first. Go back and get dominants hand done a Month later. Minimal downtime.....

Probably one of those surgeries with minimal risk!