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The K6 is a 65% (no F keys). I have a keyboard based on a Tofu65 case and I love that size. I think the K6 is a good choice and should work with OSX out of the box and I think they even provide the keycaps to switch.
If you buy something else you can look out for *QMK firmware, VIA support*
I can remap my keyboard completely in the browser to switch layouts or add custom shortcuts etc.
https://www.caniusevia.com/
I'm liking the look of the K6.