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Sign me up! :)
And in my opinion, it's perfectly fine to play on the English version. No one has noticed any differences between the English PoL 2.1, the Bukovian version, and the earlier Fargus localization. Besides, more than half of the players play on the English version.
I think it's not worth the risk and you should buy the version of Heroes that is specified in the tournament rules to avoid any misunderstandings.
Just because no one has noticed any differences doesn't mean that they don't exist and that the versions are identical.
Rules are created to be followed!
Sincerely, VDV_forever