I think it is a great idea to have specific red-link-lists for edit-a-thons or other short-term GLAM collaborations with Wikipedia. There is no set of rules about this, and placing topics on a "missing topics" list is no guarantee that it will ever be created, or if it does, that the topic will be created with that specific spelling. Having the list is more about giving a handout to people who like to work from lists, and Wikipedia has a lot of those. I would put the list on Wikipedia, with or without links out to the information on your website.
You can put a list like that in your user space on Wikipedia and use it as a monitor and personal to-do list, or you could put it on a GLAM project page where you may attract participants to your GLAM project. For the Teylers writing challenge last year we had a short wish list, but ended up with lots of different topics. I expect some of the red links on the wish list will remain red, as that project has ended, and a followup project will probably start with a fresh list according to the theme of the project.