@sshort This seems like a splendid tool, thank you! I still haven't figured out why it doesn't work, but it could just be I did something wrong or that it's just not yet fully functional, being in beta, but this is def something to keep an eye on.
Edit: it actually worked very nicely. The fonts aren't copied to the default font directories though (/Library/Fonts or ~/Library/Fonts), and oddly enough I can't find the files with find at all, which is why I at first thought it's not working. However the Font Book and other apps find them so it's all good now.
Most excellent, and very easy!