We have a discrete, and new, metal door but the inner handle is one that was in the house since the 1950’s.
On the outside there’s just a simple knob but it’s not linked to the lock. The handle works as intended but if we are not careful when pulling we end up with it on our hands.
I made a simple plate and kept the rod in place with an M4 screw threaded through it.
Looks like it came with the door: