I have a 4506 and 5906 that have that sight arrangement.
I don't care for it at all.
I took the guns down to the CZ custom shop and asked them what they could do for me.
They said to install a different sight base would require making a new plate to fit in the old but larger dovetail that is already in the gun and then cut an additional dovetail to accommodate the sight base you want.
Know that the model that I have has some "stuff" under that base related to the magazine disconnect that the smith can get to after removing the existing sight base.
If you fix the first problem, you may create the second problem if you try to remove or re-install the magazine disconnect.
I opted to leave both guns alone.
If it becomes too much of a problem for me, I will sell the two guns and get something else.
Something about leaving sleeping dogs lie comes to mind.
Just sayin'
Geetarman