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On the WoW forums there was a nice pack called CloneWoW, containing the clonewow.bat script and junction.exe - an official Microsoft file "cloning" tool.
It would create 4 different "WoW" folders next to your default World of Warcraft one, with total size of ~ 62 MB.
Which successfully clone your WoW's Data folder and all other important folders to run, but have dedicated space for the personal WTF folder, which is actually different for EU or US.
Keep in mind, this tool is bit outdated (created before the wow-64.exe existence, so they copy only the 32bit wow.exe - which is good for our botting, so far)
Then you only need to use the new World of Warcraft - US for HBRelog (If you are EU mainly)
P.S.: We are not allowed to provide such 3rd party software on these boards, so you need to search it on your own on the web.