Well, this is impossible to answer when we don't even know who are the best players available with that 11th round pick, not to mention the 14th round pick. Can you post a top-5 of players available with that 11th round pick to get some sort of idea what the trade would actually mean?
Either way, I'd probably ask for 11th and 12th round picks if you are going to do this. He wants McAvoy, so if that improves your team, then it's worth doing. The 12th round player is probably much better than whoever is available in round #24.