Hi,
I'm also Mac user I just finished building my first PC Slave it working really good...
You do need to download the PC version of all the plugin you want to use in the VEP slave. This should be easy, almost every plugin on the market are cross plateform. And you don't have to pay for the PC version. Generaly you just have to log into you user account (NI, VSL...) and download the installer.
But you don't need to re-download all the sample data. You will have to transfert the data from the Mac to the PC and relink it and/or re-activated. VSL, Kontakt, play, Omnisphere libraries will work that way.
Even an easier way, I just installed my SSD soundbanks that was on my mac into my new PC. I just bought a small application that translate HFS+ formated drives for Windows system. And I did'nt notice any performance issues. So my PC is running All Mac formatted drives (except the system drive) . https://www.paragon-software.com/home/hfs-windows/
BUT...
If your actual VEP template or presets are using AU plugins, you will need to rebuilt those VEP instances with the VST version. Since VEP V6 you can load VST plugins in both mac and PC so this is great for making cross plateform templates. But VEP V5 was using AU plugins on Mac only so you can't just open those presets.
I think buying or building a Slave PC to work with a master Mac is the best solution for us Mac guys.
Good luck!