Have you tried an iTunes Connect upload or App Store submission using this method?
Big/last question on my mind is whether one would run into any trouble with iTunes Connect/Test Flight/App Store submission using this method of framework integration?
E.g. does codesigning work the same way, as if the dynamic frameworks were embedded/built normally?
I’m not sure but I would imagine it would be fine. How would the App store know whether you organised your in one big project or as bundles?
Well, it certainly is able to tell whether you use dynamic frameworks for example, because that's how it knows to reject apps for iOS 7.
There could be a problem I suppose if you leave the .frameworks in the app bundle. I’ve found that even though iOS7 can’t use them for two or three frameworks it seems to need the dummy frameworks there and that could indeed be an instant reject,