Advice needed on manifold repair

I would not spend a dime to fix that. But If I were bored I might try fixing it myself. When I worked in an exhaust shop we welded exhaust manifolds. I would v the cracks way out. Heat the entire manifold as hot as I could get it. Heat the areas to be welded red with a torch and then weld up with a plane old mild steel mig wire.
The challenge is keeping the entire thing hot enough while the temps equalize across the entire part. Then throw it in my old garage oven with it as hot as it will go for a few hours then back the temp down over a day. My suspicious is this is far more complicated with stresses pulling in a lot more directions than an exhaust manifold.Likely wouldn't work