Just thinking aloud here;
Fixed blade sight?
Ejector rod has its own hole in the frame, but a guide along the barrel?
Will the the rod match the hole, if the barrel is turned?
The blade sight will be leaning out the left of vertical (giving a tricky sighting picture)? Means that the barrel must be tightened (If the thread is CW), might be hard, might have to put a file to the frame.
I'd go for a dove tail front sight (sideways adjustable). Much easier.
My tu'pence.