Nintendo Switch Keychain Dock. This hangs up on the wall and the Joy Cons can be undocked to take with you.

Requires some assembly using M3 heatset threaded inserts and M3x10 screws for assembly. Use stainless steel wire keychain or the Joy Con.. Screen insert can be a laser cut 6mm whiteboard or 3d printed.

Heat Set Insert x 6:

https://www.mcmaster.com/94459A130

M3x10 x 6:

https://www.mcmaster.com/90751A112

Stainless Steel Wire Keychain:

https://www.amazon.com/gp/product/B089GM9C24/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

WhiteBoard:

https://www.homedepot.com/p/3-16-in-2-ft-x-4-ft-Black-Chalk-White-Marker-MDF-Board-00066/313382855

Full Commercial License! Sell away!