OK I'm done with the linkage - looks promising and I'm confident that it will give much better roll rates.
here come some details of the 4-ailerons linkage. was very simple to do.
take a round CF rod and 4 short pieces of CF tube with matching inner diameter.
drill a hole for the axle into the tubes - test fit the assembly to the ailerons and then fix it with CA.
i use double sided carpet tape to stick the needle to the TE of the aileron and wrap around a strip of clear tape.
this video shows how it works and gives you also an idea of the control surface's throws that i use:
good night everyone...