Have a look into Heimdall or Homarr. Much easier, don’t need to worry about addresses at all. Single set up and add Tailscale exit node for external access.
I’ve been fiddling with it again today and (using Homarr) my only services that don’t work when I access through Tailscale are the ones I use names for (are.local, server.local, etc) and I can access them when I use the IP:port so when I get home I’ll just change them to IP:port on Homarr and I’ll be all good