Right now, there are two ways of achieving this feature:
1. Have a bunch of duplicate trigger technologies, the same way normal bonus technologies work in vanilla. (Looks weird to the player and causes tech tree bloat).
2. Use scripting to hide and replace technologies, to make it look like its the same technology. (Naturally has an overhead runtime cost, plus can cause issues with other mods).
I'm no good at scripting and the former option feels too clunky, even if i do shave down the amount of levels it has - so having this functionality in the API would allow for a lot more usecases for trigger technologies, presuming its doable within the engine

