Well, it could antialias in whatever the bit depth is - it wouldn't actually be noticeably slower when working off arraybuffer graphics. It's not a big deal but I thought that was one of the reasons you wanted the custom font (>1 bit colour?).
To create your own font, you could use this and an image containing the characters in a grid: https://github.com/espruino/Espruino/blob/master/scripts/create_custom_font.js
The process isn't well documented, but basically you have one array of bytes which is the widths, and the other array is just a series of 1 bit bitmaps one after the other (not aligned)
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