Fantastic!! Thanks a bunch!!! Solved a huge problem!!

Super, trank you so much✈️

Can you elaborate on the other options below delay, single direction, master link, slave link, trim, slave dual rate.

Never been a fan of mixing away various couplings during knife edge. Simply because for my part, for most models, there is a massive overlap between the rudder range I use for knife edges vs rudder usage in completely different phases of flight. Besides, what elevator compensation (and aileron for that matter) is required to maintain a perfect knife edge also depends of stuff like prevailing winds, tiny changes to CG, etc. So no mix in the world will make a model knife edge perfectly by using rudder only.