I hadn’t considered late 18-hundreds as a context, but I’m gonna stick to my guns and say wade-Giles. Wades incarnation goes back to the 1860s. Since you don’

I hadn’t considered late 18-hundreds as a context, but I’m gonna stick to my guns and say wade-Giles. Wades incarnation goes back to the 1860s. Since you don’t need the alphabet as an intermediate you can can encode each initial and final from the table[1] as an individual character to balance the number of encodings per symbol with the number of symbols per word. Since Morse typically encodes simple messages with its own vernacular I think you can safely drop encoding the tones. [1] https://en.m.wikipedia.org/wiki/Wade–Giles_table https://en.m.wikipedia.org/wiki/Wade–Giles_table