well the transplant didn't go as well as hoped
sawed out both wheels, managed to extract one bolt stub with dremel wheel and flathead screwdriver easy enough
other one wouldn't budge (even though i made sure it turned in and out with wrench before cutting loose the wheel)
drilled it out to try to get it extracted with a small screw/nut, didn't work, bought a cheap screw extractor kit, the smaller one rounded off where the wrench is supposed to turn it, and the larger one i tried next snapped off right at the surface level of the housing.
tried dremel wheel and screwdriver trick again with no luck, put a few drops of pb blaster in from other side to sit overnight and i'll try it again tomorrow.
have a feeling i'll be calling LW to see about sending it back for a new bottom casing and general refresh