No rush-- just a suggestion from a grateful forum user. My motivation: this community has been so helpful to me for so many years I want to give back.
The simplest thing would be to change the min trust to edit or create a wiki. I have mine set to basic user, but maybe you would set this community to “member.” These are people that have been around for a bit in reading and creating posts. Any trusted user would be able to create a new post and turn it into a wiki.
The more involved approach would be to create a new category called wiki and check the box "Make new topics wikis by default. Anytime someone posts in this category the first post would be a wiki.