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Well bugger me, it works perfectly.
Top gear:
Bottom gear:
Shifter is on the top tube, you can see I can get into both the big sprocket and the little sprocket. Cable routing is a mess now and the cable was only barely long enough with this housing, you can see it just barely clears the clamp bolt
Will keep this derailleur on though, the cage spring is much better than the old one I had on.
Major caveat - it works for my combo of shifter and derailleur, cannot comment on yours!
Edit: proper bodge drivetrain, ancient Huret shifter, 9-speed cassette, 10-speed SRAM MTB derailleur, £10 eBay NW ring, Shimano Claris cranks...
I think it's difficult. SRAM pull ratio is so low that you need nearly twice as much cable pulled through compared to a normal shifter. From memory it needs to be able to pull about 30mm of cable to go through the whole range of the cassette. It might have enough but I seem to remember that most Shimano-compatible shifters only pull 20-25mm at most.
Not keen on TT500 bar ends? You can get a used set for £20-30
Edit: I need to mess with my derailleurs today, I can maybe try a Huret shifter on an Exact Actuation derailleur and see if can pull through the entire cassette if you like?