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You might check out JS8call:
? ?
? ??/g/js8call/messages?expanded=1

“The idea with JS8Call is to take the robustness of FT8 mode and layer on a messaging and network protocol for weak signal?communication?on HF with a keyboard-to-keyboard interface."

I looked hard at JS8Call a few years ago, have never used it.? As I recall, it retains some of the cruft that FT8 has for compressing the callsign, grid square, and signal strength.? I'd prefer straight up ascii (6 or 8 bits) sent in the clear, error correction (RS 255/223 seems good enough) appended to each packet, a couple choices for time per bit to meet conditions, synchronized to a time standard as FT8 is.? A modulation scheme that does not require a linear amp would be a plus.

Jerry, KE7ER