Again, without having actually done it myself -- A while ago I sent one of
those to a friend of mine, a painter, who wanted to use it for that
purpose. Because this conversation has been going on, I happened to ask
her yesterday how it was working for her. Just fine. Apparently, it is
the device of choice for making transfers from slides, especially for
non-photographers.
Of course, you could just put your Polaroid back under the enlarger. This
would give greater versatility, in that you could enlarge and crop, etc.
It would also facilitate working from 2-1/4 or 4x5 materials.
We are between quarters here right now, but perhaps some of the students
would like to try this in a few weeks.
Larry