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Hmm, well then you have an opening between outers where moisture can find it's way into. But on the other hand you'd have an opening where the adjuster sits so that might be moot. I just want a solution that you fit and forget for some time.
Thrust-
If you're thinking of putting outer on the whole way then the cable stop is a little redundant ... you might as well just run outer all the way like some CX guys do. No gaps or exposed cable and you could put an in-line adjuster if needs be. Essentially would do exactly the same without fannying around with special hardware.
If you're retrofitting, cable ties are your friend, or use clamp guides. If you're not going to sell your frame, or don't care either way you could always drill out your existing stops to work like guides.
I've also seen these:
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I don't see why you couldn't do the same with normal outer and some end stops, might increase the friction a bit.