Just publish early due to a documented lack of cooperation. They don’t have to answer, but you dont have to wait.
Naturally some people find that this offensive since this puts a price to that “bliss”.
Naturally some people find that this offensive since this puts a price to that “bliss”.
And if you find something halfway through the month then oh no two weeks to reply, that's basically a standard business interaction at that point.
There's no such thing as "responsible disclosure on a technicality". Don't be a dick, and work in good faith to keep users safe.