Hi WBP,
Thanks for the shots of your dive brake assy.
It looks like you did a fair bit of engineering there.
I hope you are able to figure a work around for your linkage.
Nice job!

Here is my first draft of what I am planning.

This would use a small retract servo at the outer and inner end of each dive brake bay.
I have not yet worked out the geometry for the linkage, but it looks workable to me.