I wanted the community to know what's currently working for me. I followed your "recipe" again, but since Crossover 22 informed me that MSXML 3.0 was incompatible with my bottle, I installed only MSXML Parser 6.0 SP2. I was also informed that Visual C++ 2015-2019 (64-bit) was incompatible, so I chose Visual C++ 2019, and received no such message, but I DID notice that Visual C++ 2015-2019 was also being installed as part of the package. Oh well.
I don't have DXVK turned on, and it doesn't seem to matter on a Mac. And I'm using iTunes 12.6.5.3 - the last version with access to the App Store and one's own App Library.
Searching the store works, purchasing and downloading works. Just for general knowledge's sake, Apple has made it impossible for any Mac version of iTunes to download Apps. You can purchase to your heart's content, but the only way to get a download is using a Windows version of iTunes. So you could do some purchases, and then download them all using Windows, whether it's an actual PC, Boot Camp on a Mac, or a virtual machine. But this Crossover approach is showing real promise on a Mac. Scrolling isn't ideal, and the fonts look funny, but it works.
Thanks for the link for the Windows Desktop Runtime.