I have a Freestyle 2 and the Freestyle Edge (the blue version). I completely understand what you are talking about.
Freestyle 2 (blue) is good. Feels good, bluetooth just works, battery life is great. Non mechanical, but if you like Apple Keyboards that shouldn't matter. Also no backlight if it matters.
The Edge has survived multiple coffee spills (although the backlight on the "2" key doesn't work anymore, after the last one).
Left it to dry and sunlight warped one of the spacebar caps. Those keys are custom and so impossible to find. Tried 3d Printing one but it wasn't really usable. Contacted Kinesis support fully expecting them to say that it's no longer supported... not only it is supported, but they mailed me a new spacebar keycap, for free.
So yeah. The Edge is pricey, non-removable switches unfortunately. Doesn't come with palm rests but it really, really should. Great onboard software(again, only the Edge). And great support, to the point that I'm here advertising for them for free.
Also split keyboards in general are great since you can have all sorts of stuff in between them :)
The Touch ID issue was solved with the Apple Watch. I'm not going back to Apple Keyboards. Really trying to avoid the custom keyboard rabbit hole too :)