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Thank you for this valuable insight! =)
I have not worked with amateur radio in any way, so there are a few acronyms here to research first. (I have a background in electronics and did some research on radio-frequency transmission, but I moved to servers and Internet pretty soon)
I recalled hearing in a podcast about a similar use case with AM radio waves used to transmit data from humidity sensors in farmlands. As you say, it was extremely slow but reliable enough.
Pages I should read later:
Wikipedia - Near vertical incidence skywave