That is a good example, I think. Your earlier post is not moderated yet, so I can’t comment on it (and I realize this is probably a continuation).
I still think the only really good proof would be a source that explains the Gemara. The examples thus far seem to be more like supports than out and out proofs. If there was a reason to understand the Gemara the way that Joseph is, one could find a way that this doesn’t contradict the Gemara, such as by saying that dying al kiddush Hashem is a different category, like I did by the Y’hi Ratzon.