Yes, but that'd be taken advantage of by pirates as well. The English package would just be spread around in the same fashion as the game itself is right now. Unfortunate as it may be, you're probably not going to find a way to make something piracy-proof. Given enough time, I'm sure any means of security could eventually be cracked. Some of these pirates are extremely knowledgable.
Yeah I know, hence the reason I posted above that rather than doing everything trying to fight against people that will probably never get the game anyway, why not spend the energy on standing by honest customers?

It's actually quite the opposite of difficult. From what I've seen, it looks like you just copy/paste a file and make a small change to a registry value. It also seems that many people are not experiencing these bugs that are supposed to plague a language hacked version. It actually seems as though those who got the game legitimately are having more problems than the pirates somehow.
I said "tedious" not "difficult."

There are lots of files to change.
I have the hacked version that I brought and so far so good. Also, a lot of the bugs that I have read have to do with the Securom somehow not detecting the DVD in the drive properly, which is a bug that would affect non-hacked version too.