Thank you, I will give the blueprint interface method a shot 
!
I feel quite protective of my ideas for the project, which unfortunately makes me quite secretive and careful with what I reveal to others, but I’ll share some of the background and vision. I hope you’ll find it interesting. It is very nice of you to help, and to show your interest!
Background and vision
3 years ago my brother-in-law gave me the components from his old desktop computer so I could use that rather than my crappy laptop for my early attempts with UE. Fast forward to very late last year, he asked me (as a christmas present) for a cozy scene in UE that could be used to relax in, giving a few basic descriptions on the type of scene he wanted. He later revealed he made the wish in part to motivate me to give learning UE and game development another try (I kind of gave it up two years ago after struggling for a long time trying to solve an issue in my project). His idea worked, because doing things for others and not just for yourself makes it easier to keep trying when you meet setbacks and dead ends. The biggest motivation for working on this is that I want to create something he will enjoy (and have fun while doing it), but who knows what it might turn into if I keep on developing it.
I have now reached the point where I’ve basically made what he wished for. I however still have A LOT OF IDEAS that could make it into a real video game and not just a simple scene. In time I hope to implement cinematics, some gameplay, a story, big event-driven changes to the environment in the scene and so on. Controlling the light intensity of the bonfire is part of this, a small step on a path to something potentially bigger. So I consider it to be necessary
(edited to remove uneccessary details)