we did a split in april. after i booked it was cheaper to tack one nite on in the long run. we checked into asmovies on april 15 and out on the 16th. for us it wasn't that bad, altho a cm told my ta one thing and they did another. i suggest what you do is online check in ten days before you leave for blt. then the morning you check out, you need to call luggage assistance and have them transfer the luggage(with us they said they might do it!). they will come and collect it. now if you have your hoppers youre good to go, just head to the parks, or if you want go to the second resort, do the online checkin counter and leave your carryons once you check in.
to get to the second resort you will have to bus to a park or to ttc, then hope your bus to the second resort. im wondering if with yours you could go rite to the mk and hope the monorail to the contemporary. then get off and go downstairs as thats where the desk is for blt.
a cm told our ta that they would trsansfer us too, but didnt. its not that long, just really a pain in the butt. we left at 10ish, headed to ak, got off, waited for the wl bus, went to online check in and our room was ready cus we did it online. dropped our carryons and went to mk for our lunch ressies.
hope this helps!