HN user
I love the Kinesis ergo keyboards, but also the ThinkPad bluetooth keyboard (no reaching for the mouse = less wrist pain).
Also a fan of WASD's keyboards, but keep in mind that their custom keycaps seem to wear down pretty fast.
Check https://www.reddit.com/r/MechanicalKeyboards/ for pretty much any/all options on the keyboard front.
Even though it's not a mac, I just bought the latest Thinkpad X1 and love it- the keyboard is a million times better than the current MBP keyboards and it's tiny/light/fast, plus has USB-C charging so I can use the MBP chargers and stuff.
I think this is the point of the Living Computer Museum - http://www.livingcomputermuseum.org/
Prior art: https://www.youtube.com/watch?v=3lgluqEiQow
the posix personality still exists - it's called SUA; the Subsystem for UNIX Applications. the guys at interop systems have made a really nice ports-esque system for it so it's easy to get up and running with the usual pile of apps.
Sounds like SPOOKS!