This is exactly why I made Yaak [1]. It's fully offline, no telemetry, open source, and can even sync with Git.
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One idea: since you are doing good-faith licenses anyway, maybe you could add in the possibility to pay for some kind of one-time license? I don't particularly need or want updates from my API tool, I just want it to work and not break. I would be fine with paying a one time commercial license that gives non expiring right to use a particular version.