May not work, but I was prowling the pick-and-pull yesterday and saw a Dodge 3/4 or 1 ton van with a hydraulic booster instead of the vacuum servo. It wasn't much bigger than the MC. It needs a power steering pump to supply pressure. Very compact set-up, it was across the firewall, but I bet it would mount well under the floor.

Current fleet (subject to change w/o notice)
\'49 GMC 3/4-Ton , 60 Austin Healey Frog-eye Sprite (some assembly required), 2011 Dodge Avenger, 2015 Jeep Cherokee. No, they don't all run.
My other ride is a (B737)no, (B767)no, A320.... Update... was Embraer E190, now Boeing B787.

Knowledge is a wonderful thing, but ignorance means you don't know you can't do something.