i see. i dont have any first hand experience with shapeshift. best way might be for you to open a webwallet at mymonero.com and than transfer the funds bought with shapeshift to you webwallet, since mymonero will allow you to inlucde the payment id in the transaction for sure.
Sounds like a lot of hustle...
Do you have any spare XMR by any chance? I could buy some from you, slightly above the market rate. I only need
BTC0.05 worth. If so, I can send
BTC first, either to your address or by SD tip (but can't remember what the tip limit was).
Let me know
Edit: never mind
You can buy XMR on poloniex or bittrex.