Scythifuge: Cloudschatze mentioned earlier that the Ensoniq cards offered true MPU-401 compatibility. You might try to get one from him for a modest fee (or for free if you record some scores for him after delivery, pretty good offer if you ask me).
Sorry, the spare Elite was previously claimed...
I'm not sure that this is the best solution, in this case, anyhow.
There's got to be something being overlooked..
Just for grins, do the MIDI adapters for the Audigy 2 also work with the original Audigy? I've used the adapters from the Audigy with an MPU-401/AT, and had no issues, but wonder if something might have changed between versions.
Scythifuge, you've tried booting straight into DOS right? While games should reset the MPU, if they're not, it could be that the Windows driver is changing a setting on the card, which is left in effect if you do a warm boot into DOS.