HI Queslett,
Welcome to you, please forgive me as I know very little about the Kingstanding area, but we do have others on here that might be able to assist you in your search. Just one thing are you sure about the location of the farm & cottage? The 1915 OS map puts the City of Birmingham Kings Vale water pumping station opposite where the library is located and the farm & associated buildings on Kings Road more or less where the church is now, of course this might have changed at a later date.