Yes the al will be fine. You just want to prevent the flame from blowing under the shield and onto the wall.
I wasn’t clear before but it is easier to rebuild the entire assembly rather than trying to reuse elbows.
I would sawzall the top and bottom elbows through the curve so as to not cut horizontal (house )section to remove the assembly. Then heat and remove the top then bottom ell. It will be easier than trying to keep both heated.
Then clean the old pipe extending from the house by heating it and wiping it with a damp rag. It will smooth the old solder so a new elbow will slide on.
