Because a Windows style keyboard can [still] be reconfigured using OSX, [1] it might be worth considering the Microsoft Natural Ergonomic 4000. They're inexpensive (as little as $30 US at some retailers), reasonably robust (I've considered replacing mine due to unreadable keycaps not mechanical problems), and for me the layout ergonomics trumps a bar style layout with mechanical switches.

My suspicion is that Microsoft dog fooded these. Anyway, it might be cheap and easy enough to try as a solution.

Good luck.

[1] http://9to5mac.com/2016/03/17/how-to-remap-windows-keyboard-...