No expert, but that looks like it took a pretty heavy hit. I probably wouldn’t risk it. Depending on how bad the old one is leaking, you may want to turn the water off and deal with no water for a couple of days
I use the spray cans, and it just takes some practice. If the result isn’t good you can wipe it off and try again. It’s not an easy skill to master at all.
I have never done this myself (not a lot of drywall in europe), but I found this video which seems to describe exactly what you want youtu.be/FonedKgrP5U?t=224
Shouldn’t be a problem to tie them both together. You’ll want to add check valves on both lines before they join together. If you haven’t bought a fan yet, I highly recommend the Panasonic WhisperFit series. They pull a ton of air, are energy efficient, and are very quiet. I went from having condensation on my mirror after a shower to nothing at all.
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