Upgrading a 2MHz 32K Bee

[g67wjjk]

Again I must stress that the replacement FONT ROM must be quick enough to operate at the increased clock speed AND some factory mask programmed FONT ROMs are not fast enough either.

What would someone recommend?  I've got three in total ... two made in West Germany ... I can see a bunch available on ebay ... Intel, STM, Hitachi, TI, etc.

There's some STMs labelled "FAST" ...