Yes, you can have that option with the HHKB style split right shift or the regular right shift.
If you want it with the HHKB style, customize the keyboard to HHKB Style Split Right Shift. Either backspace option will work (split or 2U). No extra charge for the keys you want as they are included.
If you want the ANSI option, these keys would not be included, so please order the HHKB add on set which will allow you to have the swapped Ctrl and Caps Lock keys.
The split right shift and regular right shift options are not interchangeable as the placement of the barrels, the inner foam, and the PCB are different.