I would like to see a tool, perhaps even a companion app, that does this HMAC gymnastics to prior discussions to make deniability actually plausible instead of

I would like to see a tool, perhaps even a companion app, that does this HMAC gymnastics to prior discussions to make deniability actually plausible instead of just theoretically plausible. "Your honor, the defendant is clearly not Moxie Marlinspike. She said these things." "Objection! My grandmother can use Axylnotly to forge previous discussion and she is also not Moxie Marlinspike." " ... sustained."