That's a clever idea!
As far as getting the deck in or out from under the tractor, I bought 4 of these to put under each anti-scalp wheel. Makes it so I can move the deck in any direction to line it up and not have to swivel the wheels. The cups in the casters fit the deck wheels just right. I drive the BX up onto a couple 2x8s to gain another 1.5" of height. A 2" thick board would be even better. Usually when mowing, I have the loader off, so can't just raise the front with the FEL always.
Shop Waxman 1-1/4-in Plastic Swivel Caster at Lowes.com