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@pip
The short hassle free answer is: No, its not really possible due to the way the headset work.
The stems in threadless systems, clamp onto the fork and provide the mechanism that hold the headset together. A quill stem just slides into a fork (and wedges inside) so on its own provides nothing to keep a threadless headset together. You would need something to act like a clamp to hold the headset together.
Your other problem here is that, even if you could find a mechanism to allow this to work, 1 1/8" quills are very rare (made mainly for the MTB market).
AFAIK the only way really to convert a threadless setup to threaded, which is not a bodge, is to get a threaded fork (or have the fork converted by a reputable framebuilder) but this is only really a good option with 1" threadless stuff. If you're frame has a 1 1/8" headtube, then things get complicated.
Will be interested if there are any other solutions.