While I am not doing what you are doing, and I have a lot to learn about wix/msi, when I tried to install several different pnp printer drivers, each of which install using non-msi setup by calling the Difx API (or by using my SetupAPI app), I could not get them to install using DifxApp in wix. I am still researching that issue and will probably try to write something that calls the Difx API directly in a msi context and see if that will work. I also have a bus upper filter driver which I install in a non-msi setup, but I have not worked on converting that project to wix/msi yet.
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