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@Numerist
Thanks for all that. The code you include there doesn't produce the characters for A and B in my emulator, just A and B themselves. Did it do something different when you tried it?
We need both 2 and 3 in their usual positions and also rotated in other positions, preferably ASCII 174 and 169, or 65 and 66 if higher ASCII doesn't work. In the font I posted, the rotated characters are in all those positions.
I'll pass your note about rotation to my coder. I don't know how to do any of this myself.
But: is it possible to load the font and have the substituted characters read correctly?