There are several firms which will resilver prisms, first surface mirrors, etc. I believe Ian G knows of at least one. Since the "silver" is actually aluminium, it's doable at home with a vacuum pump, bell jar, car battery, and a bit of aluminium wire.
Some have actual silver, which must be overcoated to protect from tarnishing.
I do use a digital device in my photographic pursuits when necessary.
When someone rags on me for using film, I use a middle digit, upraised.