Welcome.
There looks to be a bunch of these out there, once you start searching.
As mentioned, if I was allowed to build another bike at the moment, this is what I'd be building.
I'd probably build a hybrid MTB/Road groupset. Probably a mix of Ultegra and XT, essentially an Ultegra cockpit and front mech, with road brakes, then an XT Rear Mech and cassette.
If you build one, make sure you keep us updated.