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If it does have an EPROM you can program it with a 3.3V I²C interface.
But you have to read the memory, then figure out what to do, then write it.
You may buy the exact thing tomorrow and they got rid of the EPROM and just use masked ROM.
That's how I got a dozen clickers that were useless!
It has to have an IC that looks like this:
It's from an Anker BT Qwerty keyboard.
I didn't change it much, just changed the BT name from something like KM1234 to "English" to differentiate it from my Russian keyboard.
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