Thanks for all the suggestions so far. Nuking mmcblk0p4 would indeed also kill the usbnetwork hack (which is direly needed at the moment), so I'm refraining from it. I did walk through the files in /mnt/us, and there are loads of hacks installed, but nothing really personal (anymore).
I also refrained from entirely deleting mmcblk0p3 (probably won't do it either). As it is currently, I'm happy that the device can be accessed remotely via ssh, and will just leave it in the current state. So, consider problem 2 solved as well (at least for me).
Whatever the new owner does to the device is of course up to him/her.
That said, this thread is still open for comments. If you want a broken K3 for free, drop a note here until friday. I'll send it to the person who provided the most convincing argument.
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