You mis-linked the Rocket but I found it
HERE.
For a groin injury, I'd steer clear of anything with a carbon or Euromesh seat (like the Giro.) They might work, but they might not. The Rocket or the trike would probably work OK though (hard to tell for sure without test-sits.) Prices seem OK but not great.
Looking though the list for Minneapolis, I saw this
https://minneapolis.craigslist.org/r...149408248.html
I'd call him and verify that the bike he's selling is the recumbent in the second picture. If it is, that's a RANS Vivo which is relatively rare and always desirable. Get it if you can!