One thing I didn't see him explicitly mention, but if you can get your hands on blanks you can replicate any key bitting (even Medeco biaxial and angled) with a file and enough dedication (with the exception of moving/magnetic/electronic elements, which he does bring up).

So then it's a game of getting blanks or a subset-blank that will fit in the keyway. I don't see anyone in here that has linked to the relevant Defcon video on Medeco duplication here: https://youtu.be/ij0c-236O0k

Also relevant (KeyMark tends to be the one used on exterior apartment doors): https://www.thingiverse.com/thing:5249568