Have you got the frame back and actually had a very close look at the "bent" seat tube yourself?
Hard to see how it could bend and not affect either the top tube or chainstays as well tbh.
Get it to a frame builders/repairers and have it checked out, it may be possible to straighten things out, or at worst replace the seat tube with a similar grade tube, if the frame is stripped of paint anyway then it's the perfect time really, and it probably won't cost as much as you may think.
Also worth contacting Orange and telling them your story, they may have some of the correct tubing knocking around in a dusty storeroom somewhere.
I agree with Rob, another P7 frame just won't be the same, and you'll likely regret it, maybe not today, maybe not tomorrow, but soon, and for the rest of your life
I went through the whole "loved it, lost it, found it again" thing with my Orange Prestige (see signature) and I honestly think I will now keep that frame and take it with me to my grave