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Funnily enough, I literally got it to work finally today, after failing twice or so in the past. For some reason when I would try to confirm a key, the option had nothing like this issue described, import via clipboard wouldn't work like in this issue, and for some reason any keys generated by OKC wouldn't import in desktop Thunderbird, they made errors in the app.
But I just downloaded my Thunderbird-generated public and private key to my phone, imported them, and it's usable now. Not exactly sure what I messed up previously but it was frustrating.