Christian’s image shown here is very close to what I want to do: simply copy the item name for a selection of items into the Aliases field for each selected item (as a batch process).
Well, I was spitballing because I forgot how to do it. Probably had something to do with the one and only time I played around with the wiki-linking feature (and, mind you, I was basing this all from memory trying THAT many years ago).