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Quincy
fredtc
are you after using a wide range cassette or a wide overall gear range?
I think 9 speed Shimano MTB has the same pull ratio as 10 speed road so any 9 speed or earlier Shimano mtb rear mech would work.
*Conclusion: A 9-speed rear derailleur can work with a 10-speed cassette, but only if the following conditions are met:
The shifters have to be designed for road biking and made by Shimano or Campagnolo. The system can include components only from one of the brands. Mixing cannot be done.
The brake-shifters and the rear derailleurs shouldn’t be from the Tiagra 4700 and RX400 series.*
https://brainybiker.com/will-a-9-speed-derailleur-work-on-a-10-speed-cassette-detailed-explanation/
But you could also just achieve the same goal with a roadlink