for more options i think it's better to ask this at mymkb fb page.

uh? how did you break that leopold?

Just ordered this from Taobao -> https://item.taobao.com/item.htm?id=637294463074.

2.4G, BT5.0 and USB-C connection, available with TTC or Kailh Box linear switches. Also have the option to go without switches so you can use your own switches (hot-swappable) 

there isn't anything to customize. just order the complete set with switches, when it arrive just put on your keycaps and its usable

I'm using a RKG68 now, no regrets. Bluetooth hasn't given me any issues (switching between my laptop and android smartphone). Have not tried the macos keys as no mac devices, but should work. Feel free to ask specific questions about that keyboard if you want.

Obviously depends on your usage. For me no, as the only function keys I use fairly regularly are F5 (just to start presentation). If you game then should just remap what you need.

The more annoying thing in terms of keys is Home and End, as I do a lot of typing and that's like some of the simplest ways to get to various ends of the line when not using my normal text editor.

Arrow keys available but... I'm trying to see if can live without those (do some remapping in my OS). Unfortunately RK software only allows remapping of individual keys not layers or anything. So you can change the layout to Dvorak if you want, but you can't map Caps+wasd for arrow keys for example. Long term I do plan to go 60% to save more space. This 65% is very space saving already though, already narrower than my laptop.