Running Multiple Instances of WC3 with Custom Hotkeys

[RedRockRun]

I installed Heart of Storms and kept a backup of my original WC3 folder. I still want to play custom games in vanilla though, but when I start a game, the hotkeys have reverted to their defaults. Is it possible for my vanilla game to use the same custom hotkeys file as the one where HoS is installed? If not, then do I make a second WC3 folder under C:\Users\me\Documents?

Also, I'd appreciate any advice when it comes to running multiple instances of the game. I'm guessing that it's not possible to "toggle" between vanilla and total conversions like HoS.