Fortunately or not, largest artificial accelerators are still not powerful enough to produce artificial black hole.

Sometimes from deep Universe, appear particles with much more energy than achieved at labs, and some theories say, their energy enough to create BH, but have not confirmation with decades observations, may be because scientific method need tens or better hundreds appearances in one place to confirm, but have less than half dozen.

To the extent that black holes are confirmed, sure.

I have major doubts there wouldn't be major weirdness at such an intersection of QM and GR.

Any black hole should exhibit such weirdness around the event horizon and singularities though. If we had a reconciliation between GR and QM that resolved these issues for gigantic black holes, then arguably we'd also understand small black holes.

That's what I'm doubting. There's no guarantee large-scale GR holds at microscopic scales.