I actually understand virtualization quite well and it actually works just fine on Macs. If one is running Rootsmagic 7 in a virtual environment, then there is not likely to be any concerns in regards to Malware. It isn’t like Crossover or Parellels is running constantly.
Yes, Mojave is the last version to run the wrapper, however, you note that I said that they would need to get their own copy of Crossover or whatever other virtualization software they want. That means that they can install the plain old Windows version of the software and run it. They don’t need the Mac wrapped version. I know this, because I have done it.