I have the same issue (TRIPLE NAT’d! One of which is the CGNAT). Unfortunately I have external family that accesses from media boxes/TVs so those won’t work for me.
Thankfully I was able to get a small VPS server for $2/mo and set up some reverse tunnels with auto-ssh. Seems to be working fairly well so far.
All that said, I longingly look forward to the future when I don’t have to worry about NAT.