You've gotta be kidding. The only adapters I've seen at MLCS or anywhere else are sleeves or extensions that enable a larger collet to take a smaller shank. I can't think how it would even work in the opposite direction. Do you have an example of one?
I'm with you. If these things do exist, I don't want them anywhere near me.
Anyway, the OP's question was "can I do this," not "does a product exist that falsely claims it can do this." I'd still say the answer is "Jumpin' Jesus No!" :-D "Human folly" would be supposing otherwise.