Ok, here's my cheap fix proposal. As much of the packrat I am when it comes to these IDIs and how much I always want to be prepared for the worst. I somehow used all the ATS Ford Factory and ATS 093 VP grommets that I had on the shelf.
What I did was used the NA IDI VP grommet and inserted a generic Mr Gasket valve cover breather grommet inside the NA IDI VP grommet. It slides in tight, and snaps into place when its fully seated. The look after they are placed together is much like the ATS grommet and it fits perfectly over the 093 drain as well as into the VP.
I have not used it on a running engine, but I dont see any reason for why it would leak. If a person wanted, you could use some Aircraft gasket maker inside the VP grommet and on the outside of the breather grommet to glue them together. I'd think it would work without a hitch even without gluing them together because of how perfectly they fit with eachother.
Here's a few pics of the ATS grommet compared to the one I made with the two pieces I mentioned.
ATS 093 Grommet
NA IDI Grommet w/ Mr. Gasket Valve Cover Grommet Inserted
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NA IDI Grommet w/ Mr. Gasket Valve Cover Grommet Inserted (Mocked up in 7.3 IDIT)
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As you can see, the fit is perfect and tight, some vaseline might be required to ease the fit of the drain tube.
The best thing about this solution is that both pieces are (or should be) readily available from any decent auto parts store.
If anyone thinks this is a good solution and wants me to post detailed pics of both parts separated and how they fit together I can, its pretty self explanatory.