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very pricy
Cheaper than replacing a steerer...
And even if you've got 1" threadless, I doubt there's a 31.8 stem you won't need a shim for.
Looks fine on aluminium, but yeah, pushing it on steel... But if that's what you're doing, this is the thread you'll be looking at.
The Thomson X2 is kinda flush, but pretty bulky- it's not a suggestion, this pic is just to illustrate a 9/8" stem on a 1" steerer...
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Nice solution, but very pricy and a bit bulky looking for a traditional frameset, imo.