I'm not sure if I fully understand your idea, but:
The new window switcher SwiftUI experiment was a first step to a generic "command" palette. I.e. a Spotlight/Alfred like launcher that would you let run any BTT command you have configured (or maybe even non-configured). It will also integrate with other BTT functionality like the clipboard manager, window switcher, shortcut & app launcher, the upcoming floating menus etc.
This is all a big project but I'm getting there and I think it's gonna be awesome and might even work as a Spotlight replacement. This currently has highest priority (together with the floating menus ) and I'm working a lot on this right now. There are so many actions you can configure in BTT, and having the option to not only trigger them via the triggers in BTT, but also by just typing should be really cool. I'm already testing limited versions of this and there will definitely be a first release in January.
Basically you have a trigger that opens a launcher like this:
Just instead of windows, it will allow you to search for anything you have configured in BTT.