The PCB has support for one more key there, look:
(Attachment Link)
I just felt like it isn't needed there. But I could make a poll to decide whether or not this fifth key in the right upper group should be present. That key can be whatever you want it to be, F13 or else.
The F cluster will be kept the traditional way, meaning three groups of four keys each.
I feel that this kind of top row is more appropriate for CP layouts. It's symmetric, more convenient and looks better too, imo. Boards that feature this kind of layout include: TX-CP, Zambumon SAR, BOK.CP. However, none of those boards offer both USB-C and this kind of compatibility, so I think SKB95 with this layout would have real potential.
I think it's more convenient primarily because it lets you put Delete above Backspace (an intuitive and common setup on smaller boards), while letting you keep Home, End, PgUp, PgDn above the numpad (the most setup for those keys on CP/1800).