It certainly is possible.
I’ve reverse engineered the protocol the laser uses to communicate with Glowforge’s servers (you can find a Python library here that emulates the laser), so that part is pretty much done.
You would need to write the server end of deal - which may not be super simple, though.
And, to get a stock Glowforge to connect to it would still require console access. The factory firmware contains the signatures of the “official” server’s encryption keys, and verifies that you are actually connected to their service. It can be bypassed, but only via the console.
As discussed elsewhere on this site, newer Glowforge’s won’t have the parts on the main circuit board that are needed for console access. So, that may be a significant barrier for most.