Wow, this takes me back!
Lost in the mists of time, or over 25 years ago, I phoned Fred Picker and asked the same question about the Wista I got from Zone VI. He said it couldn't be done, so I ordered a cold light source and made one anyways.
It was a Medieval torture chamber looking device made of 4x4 cedar posts which were mortice and tenoned and otherwise whacked together with the limited tools my dad had. The camera was mounted to the top centre of the frame by a 2x6 cross piece situated so the home made negative carrier was parallel to the enlarging suface, and the lens was in the middle. I think I used the lens movements to get the lens parallel-ish.
This is were it gets weird...(ahhhh, to be young and
that determined against all logic again
). The enlarging surface was a 30x30" piece of 1" plywood raised and lowered by chains from each corner. Because I used a (210mm?) taking lens, the beast was around 7 feet tall.
Go ahead and laugh, but that enlarger printed my entrance portfolio for photography school, and I learned a ton of new stuff trying to figure it all out. Can you believe I never took a picture of it
So, to answer your question, it can be done...as pretty much anything is possible if you can't accept defeat, but buying a second hand enlarger is sure alot easier!
Murray