1. Create or use a UFL class library - nice but you need to install additional files into CR runtime directory, and the code 128 font. 2. Use a font file and function that returns code 128 formatted ...

What were you trying to do? I'm trying to use a custom font Libre Barcode 128 to be able to have a barcode on shipping labels. How did you attempt to do it? I have imported fontkit, and registered it.