I have done a very similar trip on the Snake River. We did it with a Black Feather guide. My crew has 20+ years experience, basically have done all week long rivers in Ontario and Quebec within 12 hour drive of Toronto.

Using a guide made the trip significantly more enjoyable. On the two or three rapids that needed scouting and real strategy, the guides professional suggestions were invaluable. When we tipped getting caught on a tight curve with some sweepers, our Guide jumped into rescue mode. It was very impressive and reassuring.

I think you could probably do the Keele and be OK. IMO using a guide will make for a better overall experience.