You can download source code of my packager from
https://www.mobileread.com/forums/sho...5&postcount=13
Then, you can substitute existing font files with your specific font files (you should rename your fonts to names, used in the packager if you don't want to change scripts) and run build_dxi.cmd to build the update bin file.
You should have Python and OpenSSL installed on your computer in order to build the packager.