A full unicode font would probably take way too much memory.
Not necessarily. For example 8x8 bitmap font needs 8 bytes per character and as of Unicode 14.0 there are 144 697 characters, so full font would take about 1.1 MB and would easily fit into Bangle.js 2
(This ignores the fact that you shouldn't just render each character as-is as there are complex rules of how some Unicode characters should be rendered.)
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