Hi.
No I'm not in touch with the WireGuard maintainers. I'd be happy to start a dialog.
As for contributing to the project, I'll likely take a crack at porting the netlink interface to the golang netlink project (https://github.com/vishvananda/netlink) so that the wireguard interface can be automated through golang. Right now, the project just automates this by execing the wg cli.
We're also integrating this with our commercial offering of gravity, which if we see traction I'll be making the case that we should contribute to the project financially as well.