Is there a B&W film developer without limited shelf-life? For example, something encapsulated so well, that it can be stored unopened for decades? For example, something like tablets in metalized packages for one-shot developer preparation.
I used to shoot B&W film from time to time (1-2 rolls / year), and limited shelf-life of developers (both powder, stock, both factory sealed and opened) means that every time I want to shoot - I will have to throw away old one and re-order a developer which is typically too large (mixed for 10-40 rolls).
By the time fresh developer arrives it might be too late to have fun...
Surely there are known tricks - like displacing air with butane or dust-off gas, storing solution/powder in refrigerator, but it is often mentioned that it could add months - not years of shelf life.