I did the same Oilite mod as you Mike about a year and a half ago. Did an inspection of my clutch lining last week and found my Oilite bushing still looking good. I'm sure mine will last as long as any other part on my ride. Nevertheless, I like your new bearing idea. These new bearings will be open on one side only. When you stack 'em in there put them open face to open face. Some grease is more "sticky" than others and it only takes a little to coat the surfaces. Consider pushing the bearings in a little farther leaving room to then slide an O-ring on the shaft which might keep any grease from working it's way out. Personally I don't think this is going to become the problem you imagine.