@Bulgar . sorry can only help with full information, aka the mulvad information provided minuse key and actual endpoint address of course.
And your config
/export file=anynameyouwish ( minus router serial number, any public WANIP information, keys )
@scruffy Typically the issue is one account=onewireguard ip address.
You need to find a 3rd party provider that provides multiple IP addresses and then maybe its possible.
The best way is to rent VPS in the cloud install CHR on it, and then all users go through same CHR public IP to get to the internet. Pick a the VPS server in the location required.