Great garden! Mine is tiny, but enough for us. Just a couple tomatoes, cukes and peppers. Didn't get to enjoy this year as dh is gone and I was too, half the summer. But we've been growing for a few years .
We don't can, but froze a ton of tomatoes last year and they were so tasty - I still have two bags left! Gotta love a deep freezer.
Still have dried peppers too.
I think the canning process would kill anything in the sea salt, don't you? Salt is just an ingredient.... I'd try it. Manufacturers use sea salt - Campbell's, etc - and their stuff is just fine.
Can you get canning recipes with sea salt online?