You can make multiple versions of that batch file and change the %SUPPLEMENT% variable to keep the copies' data separate. As a bonus, this not only means that you can keep different versions of Minecraft installed, you can segregate different login names into their own installs with their own saves, useful for sharing a computer with other Minecraft players. Note that this will keep everything separate - remembered login, achievements, saves, Minecraft version, mods - everything.
(The extra level of folder structure is unnecessary but harmless, and it would be hard to eliminate it without breaking the sorts of things that the %AppData% convention was designed to avoid breaking.) This will make that launch of Minecraft keep and look for its data (including your saves and even mods) in %AppData%\.minecraft-supplemental\.minecraft\.
Set LAUNCHER=c:\games\minecraft\minecraft.exe This is a trivial but flexible working example: off Minecraft puts the data in %AppData%, so you can just make batch files which set %AppData% to some other location before running the game.
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