I went back and forth on using vintage tint or butterscotch blonde. They are quite close except the opacity. As far as dying first and then the butterscotch, I would make sure to seal the dye in. And there have been a few dark grain filled guitars, I thought, that came out good with the opaque fill from Warmoth. I'd imagine it would look more like the zebrawood ones. You might drop Ty a PM and ask if he has tried it, of if he has any suggestions. I am sure Tonar would be a good source of info as well.
Patrick