If that was possible, it wouldn't work, since Nintendo Network Accounts stopped accepting Wii certificates a while ago.
It isn't very difficult if you know how to decompile and rebuild CIAs. You can't use old tools though, the ACT module is just an ExeFS and an exheader, though you can probably figure it out soon enough.
You'll know the URL when you see it, it's something like
http://192.168.1.126:84/%s%sv1/api/\0api/ except with account.nintendo.net in it.
It would be possible for me to put a NoSSL patch in there and release it, but I'm not sure if I can share the CIA on GBAtemp.