So there is an overlay menu in the non +di variant I take it? This definitely wasn't the case originally - I just double checked it against what used to be one of the best resources for neek info:
https://gbatemp.net/threads/sneek-di-quick-guide.218725 (see the file structure spoiler)
So it must have been added in a neek2o update, I just need to determine which version it was so I know when to add the font.bin file.... or I could just add it for all versions, I'm sure it won't hurt anything if it's present even if not required...
P. S. Thanks for reporting!
Edit: I use the +di variant most of the time (but even that sparingly) so I'm not that surprised this got passed me. When I did my quick tests of things I don't think I even tried to access the overlay menu on non +di variants because I didn't know to look for it! Lol