Hello.
I have 3 boards available that are meant to over clock a PRO model. Myself and one Japanese Twitter user have used these totally fine. I'll also include a switch and wires and be available if you need instructions to install. I would very strongly recommend the XVI ROMs inside your PRO in the EVEN and ODD slots. Unfortunately I have run out of EEPROMs to include this.
Please examine photo.
https://twitter.com/cyothevile/status/1478191769003167746?t=FkawHnXZChXzbFCpUqq89Q&s=19
$30 each plus shipping. Most places are just $15 outside USA.