Have you looked at San Juan Huts in Colorado? They have set routes and huts that are fully stocked with food and sleeping gear. You only carry your personal gear and bike repair stuff. There are MTB and gravel routes. I’ve done a 7 day MTB ride from Telluride to Moab. Also done a gravel 3 day from Grand Junction to Moab. Days are certainly not lazy rides, but not break-your-back (well, maybe one or two…).
It’s not supported en route, but supported with accommodations and food (you make yourself). Think of it as bikepacking, light. Loads of fun and great to do with friends.