The numpad usage was super quick, but my first (I’ve got a few and all follow that pattern) was a tented, split, ortho keyboard, the Iris. The ortho part for normal typing took me about two weeks or so to get up to normal speed. The split part has definitely helped my RSI though.
I definitely have tweaked my keymap for other special keys and media usage and such along the way. I’ve got the movement arrow keys under my sdf keys (for left, down, right, up on e) as well as of up and down on w&r so that hand doesn’t have to move either. Been living the ortho split life for 6 years now and I can easily type all day at work without any issues. (I’m a DevOps engineer so I do lots of typing, coding, console work all day long)