Mike B. at Mesa did it, and you're right, they are out of faceplates.
I got a MKIII faceplate from ebay, probably the ones they made for the green stripe models, which I put on my black stripe MKIII. The original MKIII faceplate is now on the C+.
As you might know the PULL RHYTHM2 line on the early faceplates are painted, and is possible to wipe out if you do it VERY carefully so it won't leave a scratch. My belief is that they had a lot of these made for the IIC and when they got into MKIII production they put on the PULL RHYTHM2 line over the middle knob so they could be used on the MKIII.