I have no personal experience in attempting to do what you want to do. That means my answer will be based on the knowledge of how the different types of pumps work which I learned in my firefighter training courses. So I can only offer this on a FWIW basis.
This link will take you to a google images picture of how most hand well pumps work.
To work effectively the piston has to be below water level. Such pumps have to be mounted on the well head itself in order for the shaft between the operating lever and the piston to go straight down to the piston in the well casing which is below the water level.
Since you mean to draw water through the centrifugal electric pump you are going to have to use a different type of pump that does not need to have parts located in the well casing. Any pump that is not located in the water can only draft water to a maximum of Twenty Four Feet above the water level before it enters the pump mechanism. That figure is theoretical and the effective practical limit is Twenty Feet. From what you have said that should not be a problem for your situation. You will simply have to use a different kind of pump. The following link will take you to a picture of a diaphragm pump which may well work for your situation.
The entire mechanism is inside the housing that the pump handle is attached to.
The other type of pump that would work for you is a rotary vain pump. It would look very similar to the the diaphragm pump except that the handle gets turned like those on a manual coffee grinder. The drive shaft of the handle directly drives the rotating vanes inside the volute of the pump. This link will take you to a picture of a hand rotary vane pump.
The one in that picture is designed to be a transfer pump for petroleum products which brings up the possibly obvious need to assure that the pump you choose is suitable for use with potable (drinking) water. I used the word "potable" because it is the "term of art" in drinkable water systems that you should look for in the descriptions of the pumps you will be considering purchasing.
I hope that is of some help to you. Would you be so kind as to let us know how your project works out. There are undoubtedly others who would like to add a manual water pump to their systems that could benefit from knowing what worked for you.