Nice decal job on that Yamato VF-1A mickyg BTW - it really adds a lot too the toy.
You can just get a sheet of white decal film, cut it into the right sized circle and put that on first before adding the decals on this sheet on top of it. That's what Hasegawa does on its models (even though their white is sufficiently opaque enough).
With the premium that they already charge over the Bandai - I don't think any more tampo printing should justify another price increase on their end (other than just to gouge us). Boy, I'm already dreading trying to scrounge up decals for the upcoming VF-0D release, its a dark valk so we need white and with Anasazi out of the decal business, we may have to live with a naked bare toy for a long while (I still hate looking at my bare YF-19 - it sticks out like a sore thumb in my collection!)