We have just released AdvancedSearch as a beta feature to all wikis. It does not look great yet on Timeless (T192303), and some the reasons could be within AdvancedSearch, but also between Timeless and OOUI.
So why not look into this at the hackathon?
We are many people who can represent AdvancedSearch, and @Isarra seems to come as well. @Mooeypoo, @Volker_E or @matmarex, will someone be there from the OOUI people?