That’s what I mean. Still a more difficult problem than appears, or more than it intuitively feels like it should be, if speed is the goal.
The extra 6 bits returned by a single 14 bit READCODE are useless to you because of the time taken to extract them.
The word variable you get to use to address program memory is also useless to you because you only needed a 32 bit index (or 32x4).
I’d be interested to hear how you end up tackling it.