CE physical copy - possible, yet expensive work around for steam issue?

[Rekenber]

I don't think it actually flags it visually. The flag is, from what I can gather, the code that's attached to the account. Steam codes are probably a different format from normal PC codes.

Oh boo. I wonder how I could work that out? Or I could just go the expensive and convoluted route of buying the physical CE, and see if I can trade the physical CE code to someone in return for the Steam CE code. Blergh.