Yes, say map all the rotories to CC147 with 2nd data value set to 107, 108, 109 etc. set to relative 2's compliment.
Then you can midi learn in reaper.
ie reaper will see a rotary with value cc=147+data=107, cc=147+data=108 etc.
Ive got pads set to cc147 note values 50, 51 etc.
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