I fucking love Roadstars...
You could either shim or maybe build a new template, fill in the existing rout on the body you want, then re-rout.
But yeah, I'd prolly just find a 1/16" shim and shimmy shim shim. Snap into a Shim Shim.
I was thinking of doing the same thing, actually. I found someone selling a cheapo jackson body for $35 so I figured I'd try to fit it in there, hell I could probably "shim" it with a couple layers of well trimmed masking tape. The main reason I even want to do this is because while I love this neck, it's so old (mid 90s) that I have no idea what condition the frets are in anymore, so before spending cash for a level/crown I want to know if it can be salvaged into any form of a playable guitar.