[Fetiorin]

> slight stagger in the correct direction for each hand would be best

Thing is, if you have split keyboard with no stagger (grid) or vertical stagger, you can adjust halves of keyboard to suit your needs. This way you can make virtually any angle. Something like this https://www.zsa.io/moonlander/

> page up, page down, and end are on the left so that it is symmetrical

This is actually nice layout. I also see how can this be useful in gaming (few additional keys for pinkie).