I'm reluctant to grab "encoding letters" out of the curvy set, simply because there's nearly enough of them to make a complete binary-lettering alternative on their own. uhbDPB. That one is also frustratingly one digit missing from completion. If they were complete sets, you could treat curvy/rigid as a bit and thus have an easy and obvious system for translating between half-bytes and English orthography.

I'm not getting sucked back into this. There comes a point when you're just staring at the alphabet letters and thinking "TF am I DOING?"

Also, yeah obviously T can't be mapped, but I still put T in the same category as all the other square intersecting grid letters. There are other, obviously repeating groupings that would work better on a different segmented basis. Some examples: diagonals {Z N X Y A V K 7 4 W M}, circle based {O G C Q D}, loopy: {B P b d q J S 8 9 3 }, 7 seg: {L H T I F E}