I have a tracing for a 4 that @spiritbass sent me when I bought his P pickups. Most pickguard makers are going to prefer you send an actual pickguard to work with though. You will have much better luck working from the original SJ guard and getting the P opening correct than you will working from a tracing. I can see why, as it took several tries for me to get everything close.
I can mail you the tracing, but I might be able to get a digital file of my final template. That should get you closer.
My guard isn't perfect but the price was right
View attachment 3383386