Leave the retro thirds to special events only and change our current uniforms to something like Bastian Schmulling concept below
The only thing I'd add to them is a subtle outline around yokes (red on white jerseys and yellow on red jerseys) with the new shoulder patch inside. Hopefuly they will ged rid of black flaming C soon and bring the legendary white flaming C back.
White on red provides much better contrast and makes jerseys look sharper.