I'm not sure how grading companies would handle it, but there are a few things you could do.
Most modern stamp hinges won't yellow over time, and are removable. They might block a bit of the back, but with some work might be able to hold it together not blocking the back. I could send you a few since they come in packets of a thousand or so.
A lot of conservation for paper is done with rice paper and starch paste, which is pretty easy to remove. A lot of really old posters get backed with linen and the same sort of paste, but that would block the view of the back. There are a few archival supply places you could get it from.
A mylar sleeve made for an item about that size will hold the pieces pretty securely. You could simply put them in the sleeve in the right order. It's archival, would hold the pieces in the right arrangement and would not involve adding anything. Of course you'd have to buy a packet of the right size for T202s, but that's not such a bad thing.
Of those options, I'd probably go with the mylar sleeve, and not grading it. Unless it's got the big stars on it I don't see much advantage to grading.
Steve B
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