However, I do not yet publish a new version, because this problem is not very usual and workaround can be used. Standard messages (using GSM character set) work correctly with €.
I have no problem of course with the current version, as I have found a workaround.
So for me, the issue is solved.
But I think it's in your interest to realize that the problem is no so uncommon.
In non-English languages, with the help of T9, users can easily insert characters not in the GSM character set.
Just my 0,02$, to help you keep up your good work.