Kayenta is a no-brainer, though I think it is at least 5 years away. Durango already has a SC going in. But Durango isn't a substitute for Cortez unless you're coming from the north. Cortez is to southwest Colorado as Kayenta is to the Navajo res - it's the middle of a charging desert.
When I come up from Phoenix, which I have done more by motorcycle than car, I go Phx-Flagstaff-Kayenta-Cortez and that is 425 miles. On a bike, I'm done by then. My butt hurts, my knees ache, my back hurts, and my neck hurts if there is a sidewind. Durango is another hour down the road (and no SC there yet!) No, I want to stop in Cortez on the way into the state.
And I - on virtually every trip to Colorado - want to go through Gateway. Fortunately I can charge near Telluride and then again in Grand Junction. If you've never been on that stretch, you need to. It's amazing. But you have to get to Telluride (from Phoenix).
People say to go through Farmington. Besides sketchy SC, you have to drive up route 666, and that is one of the ugliest drives I can remember from Gallup to Farmington.
And once you get to Cortez, it's like they never heard of EV's. Try to find even a destination charger there - pretty scare. Charge at the pool?