These Master Food Preserver groups on Facebook accept home food preservation questions from the public.
These are people actually certified in the domain of home food preservation. They don’t make stuff up off the top of their heads — they are simply not allowed to or they will lose their designation. They provide safe, research-based advice that will be custom fitted to your immediate question.
They are usually able to get back to you quite quickly. (p.s. They are volunteers, so thank them for their time!)