Execute C++ Code in begin of Construction Script

I want to have a function from my c++ Class to be called at the very beginning of the Construction Script in the Blueprint.

I dont wanna that there is a node inside the Construction Script, cause than an other developer remove that node, and break the functionality. Thats why I wanna define it in code.

I fount already about the OnConstruction() Method from AActor, but the problem is that this function gets called AFTER the blueprint Construction Script is finished.

Is there a way I can call a function in c++ that get executed as first on the Construction Script?