alternate dos pgp client?

The latest release of Mixmaster claims to be an "OpenPGP enhancement release". I looked at the source more closely, and it seems to contain an entire pgp implementation. I had previously thought it made external calls to either pgp or gnupg. This got me thinking - has anyone tried hacking mixmaster to be a pgp client? I have compiled it under DOS before, so I know that is possible. Does anyone know if mixmaster can use 'non-legacy' RSA keys? Is there any pgp functionality that it lacks? I am looking for a pgp implementation that will run on DOS, but will also be compatible with modern key types.