You could stretch a Westwater run out by 2 to 4 days floating towards Moab. It's almost 50 miles from Cisco (WW takeout) to the Moab boat ramp, and another 15 or so from Moab to Potash, the lowest takeout. There are several access points in between. There are a few II/III- rapids on the Daily below Hittle Bottom. Scenery is nice below Dewey, but the road paralells the river most of the way, and it is busy in the daytime. There is shady camping at Fish Ford. Otherwise it's a matter of finding sandbars and islands. It's worth car scouting and noting locations as you run the shuttle. I've done the float once after Westwater, with 2 nights between Cisco to Takeout Beach. It was nice, but I don't need to do it again.
For a more remote feeling stretch of river, put in at Loma and float down to Westwater.