You could create a ZeroTier public network that anything can join. You can self host the network controller too. Still means remotes have to install a piece of

You could create a ZeroTier public network that anything can join. You can self host the network controller too. Still means remotes have to install a piece of software though instead of going straight to the host. No IPv6 I presume? If it’s CGNAT without V6 that is a shit ISP.