I once did a Mears pickup at Epcot TO MCO (years ago when I was not WDW savvy), so they may do the reverse - it's worth a call. I often see Mears busses at the parks, so somebody is taking them somewhere!
DH has taken Mears when he has arrived late to our vacation or has to leave early. They have a van. One of the down sides is that they load the van without regard to which resort everyone is staying at so you may need to stop at a couple of other places before you hit yours.