How about the wireguard documentation:
Installation : https://www.wireguard.com/install/
No raspberry pi package there but follow option b) and build it from source. They seem to have it running on a ton of other platforms so I'm confident it builds for raspbian.
They claim "easiest to use, and simplest VPN solution in the industry." So your trying that will be a good test of that claim.
Thanks for the heads up on wireguard. Looks promising.