Join Date: Feb 2007
Location: Mid Willamette Valley, Orygun
Bikes: 86 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.
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My brothers 72? TAKARA had (vandalism) an Honor Rder. It got trashed, but IIRC, it had quite a bit of "range" within the limit screws. Enough that adding a cog or 2 in the back "seemed" quite "doable" at the time. You might have to redish the wheel some or "tweek" things a bit, but it seems you are aware of that. I'd suggest you go for it with say, a 90% confidence factor?
BTW, I put on a used entry level (Wal Mart) Shimano Rder for a replacement without any problem.