Set protocol on users client

I'm giving out keys to my selfhost VPN to the friends and family members that live in another region and have a different providers.

Sometimes there's only x-ray working, sometimes only AmneziaWG. Can I somehow give them an ability to change protocols without sending N-keys for every one of them?

Maybe there's feature to do this that I haven't found yet, or maybe somebody had the similar issue and forked Amnezia Client repo. (If not so - I'll try to pull up "fine I'll do it myself" type of move)