Whenever the end of a threaded rod is faced flat or dog-pointed, the remaining, knife-like final thread is both dangerous to hands and liable to cross-threading. Accepted practice is to generate what's called a "Higbee" thread ending. Basically, the knife edge is machined or ground back to where the thread is thicker. Near the bottom of this page...
https://www.villamachine.com/design-for-manufacturing/
are illustrations of a Higbee thread and another approach, a chamfered start.
I think the method you suggest is producing something akin to a Higbee termination. But, if I understand correctly, you're also generating the dog point with the grinder. If that's the case, you could use the lathe to turn the dog point and then use your grinder setup to finish that last thread into a Higbee.
Just some out loud speculation on my part. Good work and thanks for taking the time to present it.

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