been thinking about the same thing myself. only hesitation would be those steep climbs out of the saddle where you almost make it to the crest of a climb but fall short & have to hop off & straddle the top tube
fwiw been playing with some old spd pedals I found in a drawer & on my 2nd cleated ride w the road bike, took a dirt trail. survived, so might be getting pedals for one or two more bikes