All your parts could be fit into a adjustable sight N frame. A model 28 frame with a bad cylinder or barrel would make a good donor gun. It will never be worth the price of an orginal gun though.
Someone could use a mini grinder (dremel) to taper the crack, Machine a piece of brass with .670 36 threads and screw it in then heat that area of the frame up to about 500f, tig weld it with ER80S-D2 rod while heat sinking the rest of the frame with brass. Then remachine it including running a N frame barrel tap through the frame (something I do on every barrel change out anyway.) It might crack again, but it would not "Blow UP" Lots of alloy K frames and J frames and some steel ones to, have cracked there and at worst the barrel falls off. I have never heard of an injury. But, getting someone to accept the liability might be hard. Possibly one of the micro weld companies. But, you still going to be putting money into something that will never return its value if your honest about gun if you ever sell it.