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No tilting required I don't think.
Not quite sure what or how to rig anything physical beneath it / not sure what I've got that would do the job.
Someone needs to be up there to guide it in but the ladder needs to be in vertical/unusable position for it to get through the gap. So earlier I tried Mrs CYOA up there waiting and me trying to lift it first onto a very solid chest of drawers about 60cm high. Couldn't do it on my own - can do the deadlift but needs a pair of hands to guide. Could potentially pivot it onto it somehow and then if it's hanging over the edge, bend my knees and get under it to stand/then stand on top of the thing but it would be very dangerous.
CYOA-
I really like these, not sure if they'd be of use for your situation.
https://www.leevalley.com/en-ca/shop/home/storage/straps-and-lifting/51157-forearm-forklift -
This is why I think you should lift from the loft. Straddle the gap, and with the right length strap you should be able to do all the lifting as a deadlift, provided you can rest the board as you go.
Tbh tho, this sounds like the perfect storm for damaging things and falling out with your partner. I’d hold off until you can rig something up, or get more hands on it.
withered_preacher
Nef
If you're worried about the surface, wrap it in packing blankets. Useful things to have, and only about £2 each.
Honestly, just rigging something so that you can rest it after each lift will make it less stressful and can go slowly. How tall is the loft space? Will the board be able to go straight up, or will it need to tilt as it goes in? If no tilting is required, it shouldn't be too bad.