I’ve been trying to solve this problem, too.
I have EPS files with the artwork I want, but getting them converted to paths that can be imported into programs that are designed for creating fonts — that’s been the hard part for me.
My working folder for this project is at https://www.dropbox.com/sh/k7b55wojgxsgobd/AADUqmLSNpwT0qXmgADXVRG8a?dl=0
In theory, apps like “Glyphs”, “TypeTool”, and “Font Constructor” should be able to import EPS or SVG files and make this a fairly simple process. But I haven’t worked it out yet.