it is not just a simple faceplate swap,
It needs a swap of knobs, feet, pushbuttons, and in the control amp a relocation and rewiring of the headphone jack wiring and dropping resistors and a revised power supply board.
It would be around a $300 upgrade. $200 in the RB preamp version.
My assistants tell me to not offer this right now as all are way too busy building new equipment.
Frank