Look, Vas, even if you don't have time to work out how to package it in its own download, the least you can do is spend some time on coming up with a set of steps on how to download and configure the build environment on 64-bit Windows.
We all have things that we'd rather be doing, but holding off on refactoring other peoples' code for a few days in order to fix something that has the potential to cause us to hemorrhage potential contributors is a pretty clear choice. I'm more than happy to put my ass on the line to guinea-pig any steps you come up with.
At the end of the day, we were relying on Micko, and he's left us in the lurch yet again, so we can't reasonably rely on him. As the project lead, it falls on you or some other elected board member to rectify this situation. It's outside the scope of something that an average contributor or even long-time contributors can be expected to fix. It requires intimate knowledge of how MAME's build system works, and other things that you've got, but the rest of us haven't.