Ok, I've seen the Keychron K4 and it's the perfect layout for me. I would purchase it immediately solely on that basis, except that the Linux support appears to be very poor which makes me hesitant.

You wouldn't happen to know another wireless keyboard with the same layout as the K4, by any chance? It's also ok if it's missing the arrow keys, I just want a keyboard with the numpad but without the Insert/arrow keys block.