The good news is that I believe I have Allegheny on one of my trees at my mother’s house. Although its growing extremely slowly.
Neil Peterson said that Allegheny and Shenandoah are the two earliest ripening when he sold me scions of them nearly 10 years ago, before they were available as trees from nurseries.
The other two varieties I have there are Pennsylvania Golden and Wilson to which these were grafted.
I don’t recall which varieties I have at my new place (not Peterson’s), but if I could get a big potted Allegheny, I’d probably plant it and be more aggressive with supplying it with a conducive growing environment.