Don't know if you hasve any way to do this, but doesn't take up much room. This is the front office.
That has possibilities as soon as I can figure out how to rearrange my odd shaped (not square) "office/computer/rodbuilding room" <LOL>
I do like your apperoach to this and I do have a couple of lathes to make those pretty rollers ... for those of us that are mentally challenged by pics let me see if I can understand your process.
1 - Back roller is probably fixed and center bored
2 - Front roller is bored offset which allows you to rotate and make sure rod is centered.
3 - What about the business end? How do you have the action angle attached, to a mobile stand or held freehand with a yard stck?
I just use a bookshelf - put the rod under books (have lots of heavy books) 
I do have two book cases in here but no way to incorporate them for use ...
"OK, dear. Stand still and hold the rod as level as you can. Keep a tight grip on it so it doesn't move. Then I'll take you out to eat. McDonald's or Burger King?"
Could you adapt that setup to clamp to a tabletop or something?
This is a funny approach to a problem but the wife, while more than willing to "help" we have a serious language problem.
While I speak english she speaks female ... there's a translation issue that can be frustrating at times just like when I asked her to do something simple like turn the knob (I used a swag lamp J hook and used the threads to attach the blank via painters tape) so the rod blank rotates so I can paint this fiberglass blank in my cardboard box paint booth.
I ended up doing it myself.
And John, I took her to Red Robin yesterday ... because the Seahawks scored from the redzone we were eligible for a free Double Tavern hamburger. Because it's her birthday this month she scored a free hamburger. I got out of the place for $6 for drinks