Maybe, I'm not sure how much value they really have. I could just as easily see them keeping Eflin as #6 or moving VV to the bullpen finally. Pivetta probably worth the most but also the guy you don't want to trade.
Now, if you can trade for a lefty starter, than yeah, you probably include one of them, and another starter (Eickhoff or AAA). Especially if you're getting a high-paid vet from a team that wants low-paid potential.
But I'm not optimistic about their shot at getting a LHP in FA. Hamels probably not available, Happ too old, they probably won't win a bidding war for Corbin (assuming they win one for Machado or Harper and he gets five years).
A package where they combine Franco or Hernandez with a pitcher to get a pitcher or starting OF would be nice but multi-player all-major leaguer trades seem pretty rare. Seems to me the Royals are the team to watch - I could see Franco and Eflin as a starting point for Duffy and Merrifield. If the Phillies want to move on from Cesar without being 100% committed to Kingery yet Merrifield solves that, and/or he rounds out the OF. Duffy coming off a bad year, including FIP.