I would prefer the Flyers' offer to revolve around current roster players and picks, rather than prospects. Nashville just loaded up bigtime for a run, so I was thinking someone more along the lines of Laughton or Frost (not sure which type of player would entice Trotz more, he strikes me as the type to value what Laughton brings), plus Ersson and some pick value for Askarov and whatever contracts come back our way to balance things out.
The main issue with offering this year's #13 for a goalie prospect is that goalies don't regularly return value on that level, especially not ones who are disgruntled enough to request a trade.