I`m really curious how someone come to this very special solution. 
Maybe because not many decades ago you had to deal with block sizes, Master Boot Record, offsets etc. to get your stuff working…?
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@StephanK
I read some more into this topic and found the core information for your calculation.
Very tricky and I believe there are not many users ever being confronted with such a situation.
I once had such a situation when using the Smartfilesystem on a magneto optical media.
But as I always had it most filesystems are stored in the first data blocks of a media or in the header.
This encrypting filesystem is being stored in the footer which is a bit irritating to me.
Yes, indeed, this is unusual although documented. I’d expect crypto headers in the beginning, too.
The calculation is not from me, by the way, but from @sil-van. He deserves the credit. 
Android is such a mess that I sometimes wish that the Librem 5 will set the new benchmark for mobile operating systems. A typical linux system is much less confusing - and think about mainline support - MAINLINE!
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