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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.
Nef-
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 was thinking about something along these lines - but worried about scuffing the surface too much.
My thinking at the moment:
There are two beams that run parallel with the door frame on either side of the hatch. i.e. facing the loft ladder there is a beam in front of and behind the hatch as you come up through it. They're about 20 feet apart. I'm debating ratcheting something tight AF between the two and hoping the stress doesn't collapse my roof. Then lowering [a] pulley/s above the hatch (my recollection of primary school physics meaning something like - the more pulleys / the less effort).
My other options:
Cut the fucker into tiny pieces and reassemble with PVA.
Slide it back downstairs and make a killer dining table / work bench for kiddo to do his home schooling / brain himself on the corner of.