Soooo, pushing some life back in this topic.
Did my 2-yearly big maintenance including greasing of the driveshaft and checking the small needle bearing was on the list too.
Findings:
Bearing pre-cleaning
Bearing inner race post-cleaning
Bearing post-cleaning (flush with degrease & rag)
I've considered cleaning up the inner race even more using scotchbrite/sandpaper, but voted against it for materials loss reasons. I've regreased and remounted the bearing for hopefully another 2years of service.
Question: should I expect to change this bearing in two years time? Or should I not expect it to last this long?
Also in the same subject/region: I've discovered I have some feeling play in the rose joints of the reaction rod on my bike (the lightened "sport" version of aluminium). I'll most likely have to replace that next year as well...