Wow, I read past the sunk part entirely and only grabbed onto the idea of owning two boats. Obviously, the warnings related to that, as opposed to simply being a fleet owner are warranted.
Two thoughts on the sinking.
First, there is a major difference between a fresh and salt water sinking. A short fresh water submersion can be addressed much more effectively (still a bad thing). That still requires a quick recovery, properly drying out, disinfecting, etc. Gallons of WD40.
I wouldn't touch a salt water sinking, unless it was gut to the bones and refit entirely.
Second, I don't care how perfectly she's been salvaged, she'll always be a salvage. That substantially reduces demand, when you attempt to sell, which extends the sales lead time and lowers the price. If you buy it right, you could be fine, but that's hard to know.
Finally, since this boat hasn't been sailed at all, since her sinking, you have absolutely no way to know what to expect and neither will a surveyor. Surveys only observe the present, they do a poor job of predicting the future.