@Thomas-Knoefel Just a short update on my achievements. I managed to compile everything using the original N++ sources. However, upon further investigation, I realized that if I wanted to use the Lexer, I would need to adapt a lot of code to fit into the plugins framework.
I decided to run some tests by setting the styles without a Lexer. Remarkably, I found that using Styles instead of Indicatorstyles (which I initially used for my first test) was much faster than expected.
Surprisingly, the speed almost matches that of a Lexer (even if it is 3 times slower, it still offers good usability for that purpose).But i think i will probably leave the N++ Source Code next to the Plugin to have a better updated in future for some other files.