Maybe try the really cheap fix, before going to all that trouble. May be possible to do with the radiator in the car.
My radiator was showing some light calcium deposits around the joints of top hose connectors to top tank, and tank to core edge. Wire brushed the heck out of the whole top tank, brushed on a thin layer of FlexSeal ("As Seen on TV"}. Let the FlexSeal set up for two days and then painted the top tank black. After about a year and 2,000 miles with a 7 lb cap, no leaks or signs of failure of the FlexSeal.
Radiator FlexSeal small.jpg
Radiator Calcified small.jpg