Well, actually I have thought a lot about this downgrading thing. I have 
contributed to ppa-purge and even made a PPA of that: 
https://launchpad.net/~jarnos/+archive/ubuntu/ppa-purge
I still have to fix it to keep auto installed packages auto installed, which is 
not very difficult.

I just thought of an alternative way to downgrade the manually installed
packages of a PPA or such together with their dependencies to given
distribution, but there would still be the task to remove the packages
of the PPA that are not needed.

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https://bugs.launchpad.net/bugs/1857018

Title:
   apt-get: Can not downgrade dependencies or anything with -t

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