I’ve cut brass and aluminium with my Primo. Just make sure to be patient! Keeping a low z size and a reasonable xy size is also useful. The Makita r0700 works well. You are right about the re using!
It’s a long time since I did these cuts. I think I used 0.1 or 0.2mm depth of cut. Using trocoidal cutting, I think you can go as long as the workspace has room.