I use Paterson reels, I think they are called "universal". They take 3 sizes, 35mm, 120/620, and an intermediate, which I think is 127.(posted 9851 days ago)Printing 2 1/4 sq negs on a 35mm enlarger is very easy. Just take a pair of scissors, and trim your negatives down to size ... Well, you did ask for a creative idea.
Seriously, your 35mm enlarger would need a new lens, negative carrier, condensors or diffuser, and light source. It might also need a taller column. Not much left really. A much better idea would be a second-hand enlarger.