Hey I think it's very doable, in fact I mad a simple tool to straighten my mig wire so I could gas weld with it. But back to yours. I would make the wheels out of a hard wood and have some one or your self if equips spin them and put a groove in them. It's on the line of a circle bender but dose the opposite. The wood is easy and you could have different sizes and find different uses for it.
let me knownhownyou make out, or if y'all need to toss some ideas around. Also make sure the tube comes threw nice and straight and no twisting which will add more of a torsional twist and is harder to remove. Cheers