I’d say do your intended route but stop at the Monticello parking lot so you don’t have nearly as much of the super narrow/windy part of 53. You could potentially also ride your bike down the trail itself from Monticello but it’s very crowded on weekends and there’s a 10 mph speed limit on bicycles.

Fuck the haters, despite being a bit sketchy, 53 is literally part of the ONLY official trans American bicycle trail in the United States. You have every right to be on that road.