Excuse me, my English isnt perfect.
I don't understand from your text what method americans usually use nowadays to cut a trench into a brick/concrete wall?
They still use the demolition hammers here(mostly for larger cut-outs, panels) besides double blade saws and also handheld mills/routers (English?) which cut out the complete width of the trench - with a lot of dust though.
By the way, you can remove wires from the regular wagos too by pulling the wire while rotating the connector left and right. It will leave a bit of groove in the copper and you have to take care that none of the other wires come loose while doing that. The lever type is the most comfortable way and can also connect stranded conductors of various sizes.
