The FTZ adapter doesn’t work in reverse. It only allows F mount lenses to be used on mirrorless cameras. It does not allow Z mount lenses to be used on DSLRs.
As others have posted, there is no way to adapt Z mount lenses for use on DSLRs. The FTZ adapter is basically an extension tube to get the right spacing when an F mount lens is mounted on a mirrorless camera. It takes up the same space as the mirror box assembly of a DSLR that’s missing on a mirrorless camera. If someone did build the kind of adapter you’re looking for the mirrorless lens would focus a bit closer than normal but it would no longer focus near infinity or at long distances. Basically the back end of the lens would be too far from the DSLR sensor due to that extra mirror box distance.
It’s a one way street, DSLR lenses can be adapted to mirrorless cameras but not the other way around.
