Looks like there's a MediaWiki extension which offers exactly that:
https://www.mediawiki.org/wiki/Extension:TitleKey
However, extensions have to be installed by the P99 team; "wiki admins" like myself don't have the power. This means you'll have to publicly beg/make the case for the extension to the staff (as I did to get the Multi-Category Search extension installed), or PM Rogean and sell him on the idea.