The number of 4,5,6, K consoles made is below 300, so do the math.
The processing is a piece of cake, so do you keep the 20+ year old I/O cards and write new code for the dodgy racks or make new I/O racks as well? There are tried and true industrial systems that could adapt without monumental effort as the Z80 was the automated assembly line workhorse for over a decade, but then do you replace ribbons, KVM, etc?
It would be nice just to tell that confounded SCART video output to KMA, but at what cost? And who knows what "A Day at the Beach" might look like at a higher resolution? Could be scary.
Find the Bell Labs geeks behind the ATT Core console, and you would get a real insider perspective. They cracked TR to operate a digital console.