UTF8 encoding in text icons

I’m trying to display unicode characters in a text icon within a Latin1 alphabet environment.

This works with using a antialiased font instead the system font and the encoding sequence ‘\EUTF8’ in the font name.

Unfortunately UTF8 codes, containing WIMPSymbol byte codes are shown as WIMPSymbol.
E.g. the UTF8 sequence C3 84 for the letter ‘Ä’ is shown as cross.

Is there a workaround for WIMPSymbol substitution in UTF8 context?

Of course, as the WindowManager is not aware of UTF8, all key pressed in such a icon, must be handeled by the program itself.

I found one inconsistity: the WimpPoll GainCaret event delivers the index as character count, contrary to Wimp_GetCaretPosition, here the index is a byte count.