Those are nice, but I'd rather have a inner race with a sleave between bearings to tighten up on. Thrust loads should be virtually non-existant.
A large roller (versus needle) bearing seems to be a good compromise between ball friction and plain load.
The load is spread across a greater contact area than a ball but less than a plain (bronze, plastic) bearing, with lower friction than plain but probably slightly more friction than ball.
With a single seal on each outboard side of the bearings, rapid wear from contamination shouldn't be the issue it would be for plain.
The rate of rotation caused by suspension movement would be equivalent to an rpm. Needle bearings in ohv roller rocker applications hold up well despite not actually turning a full 360 degrees. Cam profiles and spring loads can be very agressive for the size of these bearings.
A plastic bushing should rattle less than bronze. A twisting rubber oem type bushing would not rattle. It would also act as a damper. When tightened at ride height, it would resist both rebound and compression.
I don't know if you guys have this link for universal plastic bushings: