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I do not think the concept of using the bus OTR for driving and when parked is a bad idea.
However there are several issues that have to be addressed. The first is the evaporator has to be sized to handle the size of the compressor. I see no reason the condenser side has to be modified. Obviously the controls need to be sized for the new system capacity.
The thinking about the motor driving the compressor has to be reversed. Stick with a single compressor, but instead of engine driven have it driven by the alternator or shore power providing the electric. The existing OTR compressor I believe can pull almost 30 HP so a decision has to be made about how much HP an electric motor driven compressor can be, knowing the likely limit is the 50 amp shore power which is also going to power everything else on the coach, including the condenser and evaporator fans.
The reality is even a 30,000 BTU system may be too big because the evaporator and condenser fans themselves suck a lot of power so while it makes sense to use the same system for driving and parking a whole lot of engineering will be needed, and then you will have a system with no backup if something fails.
I’ll stick with my OTR and 4 Cruiseairs which can be repaired with off the shelf components.