The plate will really depend on how high your console is. The H pattern will get bigger the farther away it is from the shifter base.
I'm not promising anything, but I have a CNC mill and just got a 3D printer.
Send me some information:
How thick do you want the plate
Outside diameter of the plate
Distance of H pattern front to back (measure actual movement, don't include clearance)
Distance of H pattern side to side (measure actual movement, don't include clearance)
Distance of R leg side to side (measure actual movement, don't include clearance)
Diameter of shift shaft
How much clearance do you want from shift shaft to the plate?
Where is the R leg is located (I.E closest to 1st gear pushed forward, or pushed back)?
It would take 5 minutes to draw it in CAD and I would like to 3D print something other than a stupid Yoda figure.
If it works, I'll make you a good deal on cutting an aluminum plate or give you the CAD so you can get it cut somewhere else.