The thing is that if someone tested 50 to 68 pion adapter on Amiga and it's working, then you will connected with the SCSI harddrive that is not supported by A4000T and it is NOT working, so what's the point?
P.S.
All 50-68, 50-80, 68-80 adapters works with Amiga, I have tested dozen of them. They are just wires. No electronic inside.