Ya, tensioner modification sounds like a pretty good idea. Just have to make sure the two are shaved down pretty accurately to get the perfect true.
I'm actually needing this for pitchfork xlt on a 22" street bike. Not too many fork options with 33mm dropouts right now.
I want to run 2.4 tires and it works now, but i just have to keep the tires very true. It's like 1-2mm away from the fork.
My forks happen to have decent length dropouts though, so there's room to scoot the tire out 3-4mm if i can get one of these slammer things to work.