Country dependent numeric keypad

I am trying to get the numeric keypad, that pops up with a numbers-only text box, accepting comma as decimal separator. That is, according with the device country language.
It looks like it is not possible, is it?

I found this related quote (although not exactely the same issue): "The usual approach is to use a text box that replaces all commas with periods before you feed the result into
any math blocks". It seems is not the case for me, AI2 does not do it that way.

I also found Taifun's workaround about using replace-all block for math operations. That could be useful if I get a math operation error afterwards, but first I need the user to use the comma in the numeric keypad.

Thanks & merry Christmas.