I've heard very good things about the Keychron keyboards[1], especially on a Mac (the design is almost Mac-first) - the K1[2] and K3[3] are both low-profile and should be as quiet as a mechanical keyboard gets with Red/brown switches and you can opt for optical switches too - also bluetooth so it's fairly portable. Although there's no firmware/software to remap keys so you'll need to do that on the OS side.
Companies like HAVIT[4] and Coolermaster[5] have made them too, but I haven't heard much about their stuff.
I'm currently on the Havit. Excellent key response with lighter weight and shorter travel. Typing on it takes much less effort than my other blue switch keyboard.
This "low profile blue switch" uses a click bar, so the click you hear does not correspond to the actuation point exactly---which I am a bit bummed about---but I hear the majority of low profile clicky switches currently have the same implementation/issue.
This "low profile blue switch" uses a click bar, so the click you hear does not correspond to the actuation point exactly---which I am a bit bummed about---but I hear the majority of low profile clicky switches currently have the same implementation/issue.