Hmm.. Carrara can use any font that is installed in Windows.  I suppose I don't completely understand the need to even convert the text to an object.  If you have the font as a TTF font, then it shouldn't be a big problem.  If not, then I get what you mean.  I have some spare time if you would like, I could take a crack at creating it in the spline modeler for you if you send up a decent image of the font and text.