The fonts are not meant to appear in the fonts menu.
This is actually specified in the beginning.
Quote:
First of all, an important notice for FW >= 5.4.x users: you will not see your custom fonts in the Aa menu on this device. Currently, the only way to actually use your custom fonts is thus to use the font overrides feature.
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That should read "KUAL 2.3 or later". 2.6 is definitely newer than 2.3