I have a 1999 Carver 350 Mariner with twin engines and my Starboard side seacock for my water inlet froze open. After several alternative steps to break it free, I had a slip neighbor use a little more leverage and broke off the brass handle. Luckily no water leakage but I'm assuming my only option at this point is to have boat taken out of water to replace or can this be done while in my slip? I've considered creating a temporary bypass valve in between the broken seacock and the sea strainer just so I can clean out my sea strainer and wait to remove boat from water to do other maintenance because of the extreme costs. Any other thoughts or ideas out there from the group would be appreciated?

Thanks
Steve