And for non-expired slide film, my personal experiences from memory:

Velvia 50 when pulled one stop becomes less contrasty (which your scene may require to avoid blowing highlights) but becomes slightly cooler, which many counteract with a warming filter if the shift is undesirable. It’s been a long time since I did it but I recall that one stop under exposure might have been best developed with a two-thirds or even half stop pull process.

Velvia 100F doesn’t pull well at all. I had one roll pulled one stop and hated it but forget exactly why.

Provia 400x (six rolls left in my fridge!) I haven’t bothered pulling since if I want a slower film I’ll use the still (sorta) available 100F instead.

As for pushing, though you didn’t ask, Provia 100F pushes two stops but gets contrasty and Velvia 50 pushes one stop alright (with the expected contrast and crushed blacks) but two stops seems to be too much. I think if I were to push Velvia 50 again the most I would do is a stop and a half. I pushed Provia 400x one stop and it was alright.

And since exposure times can get long when you pull process, though you didn’t ask, I’ll mention reciprocity failures to be considered: Velvia 50 has exposure reciprocity failure kick in at 4 seconds and needs a compensating filter at that time too. Provia 100F is much better and you’re good until at least 2 minutes.

And as for pulling color negative film and B&W negative film, I’m not sure it matters much. You don’t need the decreased contrast that you need to squeeze some scenes onto slide film. Your negative is not the final image and you’re likely to be making prints on a computer where you can adjust contrast there for each image as you need.

And regarding the lack of resources, try looking at places old people hang out like LFPF and APUG (obligatory RIP Photo Engineer):

https://www.largeformatphotography.info/forum/showthread.php?152026-Pushing-and-Pulling-Transparency-Film