Meh, everything's converged on https now, unless you're loading from file (in which case you probably know already). With any other scheme, the browser is going to pop up a massive DANGER WILL ROBINSON that you have to click through.
The scheme is rather pointless to display in a browser bar nowadays.
Having a separate scheme for HTTPS was a mistake anyway. TLS should be a transport detail that doesn't change the URL at all just like DNSSEC, IPv6 and QUIC don't change the URL. The browser can still display the negotiated encryption and you need HSTS anyway to fully protect against downgrade attacks - and as older ciphers are broken even that is not going to be enough.
The scheme is rather pointless to display in a browser bar nowadays.