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hugo7
If I were in your shoes I would try an exhaust expander tool that will fit in the gap at present and use it very carefully to try and get it round again. But be super careful not to expand it. You may be able to get it round again if you’re very very careful. I would grease up the bent in part and just go as carefully as possible.
This would be the best way I can think of doing it that gives you control and can save you going too far. You just want to avoid stretching the metal or cracking it. I would hope it goes back in to shape doing this and I feel it’s probably your best chance with available easy to use tools and not using a hammer or anything that could make it worse.
My only worry with this is that it’s hardened up to the point that it wouldn’t go back easily and will put pressure in the wrong areas and make it worse.
Before you do it research weather heating it would help. It might aid it, it might not. But don’t just blindly heat it hoping for the best as you could make it worse.
And maybe test on an old frame or bit of tubing first if you can to see what is likely to happen.
For the lip, you might be able to prise it back and gently get it back to shape. That’s the part I would worry most about cracking.
I have an idea but would require making a tool or jig. I’ll have to get back to you on that one
I’m assuming you’re at a point where you feel you may as well have a go otherwise it will get chucked in the bin….