client config, and using pkcs12 file, as opposed to import

[ziggurat29]

folks;
I would like to use a regular pkcs12 file instead of importing into the credential store. Don't get me wrong, I love the credential store, particularly the hardware backed one on my Nexus7, I but I do not like the device passphrase requirement for it's use, and am perfectly content with entering the pkcs12 passphrase.

I tried adding the obvious:
pkcs12 "ziggurat29_nexus_7.p12"
with no luck. I suppose I'm not surprised, because I would imagine a path would be needed, since it cannot be inferred from the location of the config (who knows where that is stored). But what should the (full) path be? (for this discussion, assume the file is in a directory on the SD card called 'creds'). And is this mode even supported?

Feel free to point me to existing info for android, if it exists, but I certainly could not find it after some time searching.

Thanks!

P.s. some years ago I submitted a patch to include an 'inline' pkcs12 file in the config file. Don't know if that ever made it in (or was subsumed by some other function), but that featurette could be handy in this case.