Minecraft Portable (Read b4 u HATE!)

I would like to make a portable app launcher that will NOT have the Minecraft data built in, but will do a simple temporary change of the %APPDATA% variable to make Minecraft store all of its data on the portable device. I can set up a whole batch file to do it all, without a GUI and simple backup on hard drive, (possibly) I just need someone to help me set up a PortableApps launcher/installer. Does anybody have any ideas/ways you can help to get this project DONE???

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