Marmox dot and dab - deep bed adhesive

[TreeFellaPete]

Evening all. I’m trying to find a deep bed cementitious adhesive for dot and dabbing Marmox boards onto uneven brick walls. The maximum I can find is about 15mm bed but I’m looking at dabs of 20+mm higher up the walls.
I will be mechanically fixing through the dabs. And I want to avoid battening due to the uneven brickwork- packing out would be a mission! Any product suggestions gratefully received! I’ve searched existing threads with no success.

 

[Stupida]

Did you get an answer as I am about to do the same thing

 

[robinbanks]

Fill the hollows where you want to put the dabs?