Here’s the DOWN and DIRTY @Jerry-Graves. Use your hacksaw and cut the rusted out flange connection at about 4 inches ahead of and behind it. take that cut out section to an independent muffler shop and have them cut a piece of pipe and swell the ends to fit your pipe and get 2 U-bolts from them. Clamp the patch pipe on and install a piece of hanger to one of the U-bolts to support the exhaust.That patch will almost certainly have a noticeable leak but you can drive with it installed.