Others may condemn this idea but I think you have afforded an excellent repair and I would think it would do you until you need to haul out for the winter. When I bought my boat, the galley sink drain through hull had cracked on the "dry" side of the old original gate valve and it was held together with the handyman's friend Duct Tape. Yikes. I cut the through hull and the valve out with a hacksaw and replaced both before I put it back in the water at my marina. I have since replaced all of my through hulls from the orignal equiment (in 1978) gate valves to proper ball valve seacocks. Heeling the boat at the slip is an ingenious idea but I think your chances of sinking are very low and I would enjoy the rest of the season and do the work when it is easy to get at both the inside and outside of the hull. I would suggest changing the through hull along with the valve to ensure a proper thread match. The through hull is inexpensive compared to the valve.
If it was my boat, I would leave it as is until haulout.
Georgian Bay, Ontario
Catalina 34 - "Good Idea"