Actually, quite many of us are using pull-pull rudder. Elevator has two halves, so it is double work compared to that.
The worst part of installing pull-pull system is finding the right location for wire exit hole. The rest is a breeze and less work than fabricating push rods.
My concern is the ability to remove stabs for storage and transport. I need to remove them occasionally and prefer servos in stabs. Seeing others remove wires, that doesn't seem to be an issue either.
IMO, bellcrank elevator is the most complicated solution and not worth the effort. It sure looks neat and eliminates the need of stab incident adjusters. Still don't like it because of extra work required in setup.
Unfortunately I do not have any knowledge of Mr. Bruckmann's plane nor details. Interesting approach he has at least.