I think if they take back a bad (but not so bad) contract, like Kingery, the bullpen-deficient Phillies might be willing to listen on a Major League arm that has untapped potential but is simply not working out, like Nick Pivetta or Vince Velasquez.
FWIW, a trade of Workman for Kingery and Pivetta on the infamous baseballtradevalues.com simulator is acceptable, and a trade of Workman for Kingery and Velasquez is a minor overpay. A trade of Barnes and Workman for Kingery, Pivetta, and Velasquez is acceptable...