I've written a module that checks if there are pages that have the same name as the current page, except that a number at the end is one more or less, and adds relevant links.

There's no way to manually override the links yet. Also, maybe it should be wrapped in a template, as is suggested in the help. Otherwise, you need to supply a function name, which may be confusing.

Mall:Bläddra now uses the module and automatically adds links for previous and next years, when those pages exist. It can still be used as normal, i.e. specifying link with parameters.