Hernandez is very capable at 2B and in CF.
I could see him playing about 50-50 at each.
While Arroyo does not excite me, either, neither does Beni in CF or Renfroe playing RF FT and Verdugo in CF. If we add only Hernandez and no other OF'ers what's worse? Arroyo/Munoz/Chatham/Arauz/Chavis at 2B or a not-ready-for-prime-time Duran in CF or Beni in LF FT, Renfroe in RF full time and Verdugo in CF?
Now, if we add a CF'er and Hernandez, I agree, Hernandez is the FT 2Bman.
On Munoz, if he does well in AAA, he could very well end up back on the 40 man roster and playing 2B/Utility for the Sox in 2021, especially if we don't add a 2Bman.