Camera rentals are in place supported mostly by professionals that need a particular piece of gear for a particular short term assignment. I have used them to try out a lens but found a place close to avoid the shipping barges.
I’ve also used the Cable Co to try out about 10 different cables. But I’m going to say those are less fragile than a Mola Mola.
from the consumer side, I could see spending 750 for a two week in house demo to see if I wanted to purchase. More than that, I can fly to a dealer who can have one set up for me.
all in all, just too much risk on your end.