QUAERITUR: What will the former Pope’s coat-of-arms look like?

From a reader in the combox under another entry:

I propose that for Benedict’s new coat of arms, he should keep the keys but remove the mitre and pallium, replacing them with a white galero with 21 tassels.

I have not heard anything about this yet.  This proposal, however, seems reasonable.

This is a rather new situation.  In the case of the last abdication/resignation, Gregory XII went back to being a cardinal.  In this case, Pope Benedict (I can still write that for a few more hours) will be (how strange to write this…) “Roman Pontiff Emeritus”.  Thus, he can’t have the pallium.  He changed the tiara to a miter, so it seems that should be removed.  The galero, used but in white, could be a good compromise.