Hi and welcome to the forum,
What you are referring to as a Heat Pump is actually a dual use system. There is an air conditioner built in to it for cooling just like a conventional a/c. The Heat Pump function is to warm the inside air when it is chilly out, and will work effectively down to about 40 degrees Fahrenheit. The thermostat should have separate setting for a/c and heat.
I'm not familiar with your particular layout, but if it is like most modern 5ers your main air conditioner is ducted to cool the front and rear sections of the camper through outlets in the ceiling.
I think you will find the factory arrangement is probably the better way to go, once you figure out the thermostat settings.
Good Luck,
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Steve & Jan, Ava & Emma (Mini Schnauzers):
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