Hi Matt,
I feel your pain, sometimes manufacturers do the dumbest things with no forethought about maintenance. I have only briefly worked on an Evo and not on the underside but what I am thinking is that they had to run the belt across to clear the steering because that is a huge improvement over the Anniversary ones, they were terrible. The Anniversary ran the belts straight from the motor because they didn't have to clear the steering. Once you get the pulleys off you will be able to see how you can replace the bearings in them, I have cut a couple open and fitted new bearings in them, but can't remember how I did it. The other alternative is to just google around looking for idler pulleys something out there will fit. doesn't have to be for a Greenfield. You might have to make up a bush, or use a bigger diameter bolt, plenty of options just a pain when you can't get a part off the shelf
