Not exactly what the GP asked, but there’s also Wireguard in the iOS[0] and Mac App Stores[1].
Wireguard from the Mac App Store works successfully with Little Snitch (per-app firewall) and comes with a menubar icon that shows connectivity and allows quick switching. With the commandline-based version of Wireguard (installed from homebrew or wherever), Little Snitch sees all traffic as originating from the wireguard-go process. This is because the App Store version makes use of MacOS’s new network extension API, and Apple has only made that available to apps distributed through the App Store.