How to complete a random researching tech

[binaryferret]

I'm working on an event chain that on a crit success (from random list) the player is rewarded with a current researching tech being completed.

I'm having no luck so far in finding an elegant way to do this. I could just go through ALL the techs and if it is being researched then complete it, but that would mean a fairly massive if/else branch.

 

[allocater]

Only thing I can think of is that is possible is: give him research points into the stockpile or give him a buff that multiplies research for x month.