Are you saying that it does work with open suse tumbleweed with the stock kernel?
I havent run opensuse much as a server but am always looking at it and Arch.
Probably going to switch to Arch eventually because the arch wiki is just the best docs I’ve found.
If you’re not relying on say a closed source driver that needs to compile for each kernel update you should have no issues there.
If you set up btrfs snapshots to run on updates then you could always just roll back if there’s a bad one. That’s how my arch laptop is set up.
Personally wouldn’t use Debian testing over arch or tumbleweed though. I think there’s something to be said for being on the same packages as the maintaners and not a testing version.
Use wg-easy has a dead simple web ui then just send your friends a link to wireguard downloads page and a copy of the their .conf file it has an import button.
I just tell them its the app you need to connect to my network. True enough and I’ve never had anyone have much issues.