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You can specify where the cache directory is located with the command line argument --cache=fullpath. This and other command line options are documented at https://wingware.com/doc/install/command-line-usage and I think it should be possible to write a .bat to put on the USB drive and then start Wing with that.
Since you mention using a .bat I'm not sure if I'm answering your question. I think the command line option is the only way to do this, though.