The Microsoft Sculpt keyboard is my perfect keyboard. They discontinued it a couple months ago, but you can still find them in Amazon. Tented and split (though it’s one solid unit, so no customization) with a separate wireless numpad for exactly the reason you described. Typing on anything else makes my fingers go numb after about half an hour.

Still thinking about trying a fully customizable one someday though, but I’m not sure it’s worth the expense for me