Just FYI, in case it's not on your list already:
I count 8 lines of 20 characters. Assuming LoRaWAN rather than plain LoRa, SF12 allows for 51 bytes. This is roughly about a third of the number of characters, giving you a character set of about 80 glyphs. For English, that might suffice...?
(It would need 2.8 seconds air time on SF12.)