Today's #FreeSoftwareAdvent (better late than never) is "WG Tunnel", an application for Android for bringing up and tearing down WireGuard tunnels.
I use it to keep a WireGuard tunnel running all the time on my phone.
I don't do anything fancy with it, but if one wanted to use different tunnels for different things, or when connected to different networks, or wanted a SOCKS5 proxy for other apps, it is definitely worth a look.
(And available via a custom F-Droid repo.)