I would use the same approach that I used to ‘digitise’ all my old audio cassettes: put them all in a black bin bag and drop them off at the local tip.
Srsly, if all they’re doing is sitting in a shelf gathering dust, that suggests you’re not looking at them often enough to be worth keeping - and certainly not often enough to justify the cost and/or expense of digitising them. Life is too short - and you can’t take them with you.
That's not very well thought through on several levels.
- Audio cassette content can be replaced.
- Photos are a valuable resource to some.
- The reason they weren't looked at, and gathered dust, is probably why digitizing them is a good idea.
I've digitised my 35mm slides to make them available to my wider family.
If someone wants to digitize their 35mm slides I have a (Free) projector to anyone willing to collect from Andover in Hampshire.