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USE_ALT_FONT "hidden feature" was killed with fw 5.4.x (Last PW1 fw that had it was 5.3.9, and I don't recall if PW2 ever had it, even on fw 5.4.0 that was it's factory firmware). So all Kindle after PW2 = no USE_ALT_FONT thingy.
You have only 2 choices :
1) embedding your custom font to EVERY single book (you have to use new azw3 format, no old mobi) you read.
2) jailbreaking and then using fonts hack to override one of the built in fonts in Aa menu (Caecilia condensed).
No more adding fonts to that Aa menu on firmware newer than 5.4.x (at least not without edition system files & recreating cramfs file containing built-in fonts).
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