I realize now that I was a very unclear in my post and i apologize for that…
The problem I had was that when I hit apply in the material editor, the “used with static lightning” flag would then be checked again automatically, even though i had unchecked it prior to applying the changes.
I solved this however through putting a black material on the mesh and then change it during runtime through blueprint, thus preventing the emissive material from being baked into the static lightning. The material could then change again without any weird looking static lightning in the environment.
Thanks for reaching out! But I think you will help people better by looking at more recent posts I should have marked this as answered really, I just simply forgot!