Hey man,
you for the reply, unfortunately I could not wait any longer and had to rebuild everything from scratch.
But I also don´t know blueprints yet (most likely never will), we are only working on linear content (for a TV show) so I only need to be able to animate the parameters in sequencer.
By now I´m guessing either noone is really using material layers yet or they just can´t be animated in sequencer yet, so hopefully a new release is going to have that functionality.
It was so nice and elegant not having to account for every possible blend mode and material type in one massive material…