I wouldn't trade Beni, but assuming the Betts/Price deal with LA ultimately goes through, I would indeed call the Padres back and see if they're still interested in sending us Myers...with our newfound payroll flexibility, we could take his contract along with a prospect or two.
Myers (full money), Campusano, Morejon, and Quantrill comes to a flat zero value on the trade simulator...Quantrill would become your #5 SP, and you get a couple more prospects to revitalize the system. Send the Padres any warm body and call it a day.