Well, the point of bringing them to MSFS would be to fix all of the things in the models (redoing the textures, as is done in making FS9 models “FSX Native”). The only one you’d be stuck with would be the <65K polygons… which, yeah, I bet people would be, umm… concerned.
The other big unmentioned concern would be the reflected textures, which, the only way to fix that would be to remap the models. Given they’re so low poly, I wonder if that just means copying the offending texture and relinking the reflected patches to the new file.