You can absolutely use Bootcamp Windows to play. It's not really that much patch work, it runs like a normal Windows install. The only difference is you get your drivers from the Boot Camp tool, and you have the option of using 3rd party video drivers to squeeze some more performance (bootcampdrivers.com, but that is indeed some patchwork at that point.) I definitely recommend trying it, anyone who has an Intel Mac. The Bootcamp tool is pretty self explanatory if you want to do a default install (has to be on your main/internal hard drive) but if you want to put it on an external, completely separate drive, that's also possible and there are some very thorough guides on how to do it step by step like this one.