While I love the look of downtube shifter, you should consider that: https://www.wolftoothcomponents.com/products/tanpan It allows you to use dropbar shifters with XT derailleur.
Road 10sp stuff should work with it as is, I think it's compatible with 9sp mtb. In any case, I like the dt shifters and am keeping them.
@yoshy started
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While I love the look of downtube shifter, you should consider that:
https://www.wolftoothcomponents.com/products/tanpan
It allows you to use dropbar shifters with XT derailleur.