I've never seen one but the airlines are legacy enough that there might be an interline agreement from 1960s still lurking in the background.

T2 to T1 it is, not a good transfer given the time. You have to enter Germany anyway, so you might as well try and get the boarding passes on the check in desk in A.

I would otherwise suggest going to Z and a transfer desk, but I'm not sure that there is one you can reach, as transfer security might require you to already have the onward BP.