Alright, new idea. Fabricate a metal plate and bolt it to where the A/C compressor would normally go on my engine. Have some locating pins sticking out the top (Tapered maybe?). And a few cam levers like those quick adjust bicycle seats or just wingnuts with huge wings for MAXIMUM FINGER TORQUE.
That leaves me with a quick detach system for mounting ~whatever I want~ to be belt driven by superior inline engine of 6 cylinders.
Air compressor, water pump, welder, generator head, hydraulic pump, whatever I can cram a serpentine belt pully onto that spins.