I will be taking measurements when I replace my bushings and will be working on finding the bearings and I will make my own pivot pins. More to come later.
Doesn't sound like a bad idea...
I think alot of people read about the stock bushings wearing out quickly and think Polaris cheaped out by not using something like Delrin and I would probably think that to except in this case they have a faily good excuse,they have N/H/V to consider same with the squishy motor mounts ect...better performing/lasting bushings,driveline mounts ect tend to have side effects that could irratate some operators.
The soft stock bushings likely absorb some shock/feedback,would be interesting to see/feel the difference in the stock bushings and a solid mount bearing set up like you are talking about. My concern with your idea would be the outer bearing race to a-arm tube fit/wear and with the thin tube being able to press fit a bearing tight enough so it didn't move in the tube and wear out the tube.