I hate to be that guy that says "hey, I've got this brilliant idea; I just need someone to do all the execution," but here goes!
I've got a number of vintage Apple Extended Keyboards that I've been wanting to modernize for ages, and one project I'd like to get off the ground is a conversion kit to modernize your Apple Extended Keyboard or Apple Extended Keyboard II (AFAIK they use the same sized PCB so I think they'd be interchangeable). The primary advantage I'm looking for in such a modernization would be adding native USB support as well as NKRO, but I'm also open to other features, like retaining one or more ADB ports so it can be used with original Apple hardware (in fact, ADB itself supports NKRO; the keyboard just lacked diodes as a money-saving measure), and also custom firmware support.
The catch: I know absolutely nothing about PCB design or getting things manufactured (I have done one of these conversions on one of my own keyboards, but it was a hand-wired job with a Teensy and it's a mess). But small-scale custom projects like this are exactly the kind of thing Massdrop does on a regular basis.
If I could drum up the interest here on Massdrop is it something that can actually be made a reality? Has this kind of thing been done?