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Was the stump grinder a massive thing?
This is the one I was going to rent:-
https://www.hss.com/hire/p/portable-stump-chipper
With two people you'd easily be able to carry it through a house.
Depends on the size of the stump though. That one does 25cm above ground and 23cm below ground. (The diameter of the stump isn't particular relevant, it just takes longer to work through it all.) A bigger stump chipper is going to be bigger and heavier...
This is what I did. Have run out of stuff to destroy now and need to start putting things back.
Was the stump grinder a massive thing? I have no access to my garden other than through the house and I'm pretty sure there's one lurking where my shed base needs to go. Might be very old so I'm hoping it's nice and rotted.