That's not what HTTP/2 does. If what you want is to tunnel past a firewall, establish an SSL connection and run any number of existing VPN protocols over it, and you can continue to run TCP/IP just fine.
You can run TCP inside a TCP connection, but your bandwidth throttling gets a bit strange. Your inner TCP sees delays instead of packet losses and that isn't how TCP is built to throttle.
As a practical matter, the percentage of customers who will put up a VPN to use your service is vanishingly small.
As a practical matter, the percentage of customers who will put up a VPN to use your service is vanishingly small.