That's an interesting use case. I don't expect for DNN to add this as a feature anytime soon, unless someone passionate enough does that work and submits a pull request. However, this sounds like something that someone could build. It would just need to be a module that's specific to this use case. The cool thing is that much of the required development work is already inside of the DNN API itself. Everything else would be to achieve the exact export and import use case(s) you're trying to resolve.
The alternative is to use the site export and import feature, but that's overkill for this and was never meant for a smaller use case (as far as I know).
I would suggest to:
Yep, that would currently be the best way, thanks Timo.
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