If that's really the only thing you are looking for, then I'd suggest you to look into Lion_TS's tools. They aren't as expensive as A6 or A7 pro.
i totally knew that this was coming, and yes, i know that there are alternatives, but a) they do all feel not being in a mature, productive state b) most of them require some kind of code customisation and c) it's not the same after all.
yes, i'm fine with excluding these versions ("a6 dead end edition") from updating to a7. I did not think about that in the first place, but it makes perfectly sense, otherwise it would be commercial suicide.
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