Maybe a bit late now but ..
Worn thrust washers shouldn't make the clutch inoperable, just difficult to find neutral when stopped and the clutch dragging when disengaged.
Removing some cable slack will help; as will re-tightening the centre nut on the clutch basket once you get to dismantle it.
The washers tend to wear on one side so turning them over might help too.
Please give an update when you do take it apart. I'm curious about the outcome. Best of luck on your trusty DR.
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