I agree with dog. While the chainplate in pics 3 & 4 looks good, the original method used on your boat is probably stronger with a solid bulkhead properly glassed in as it spreads the load over a wider area. Most manufacturers use a method like this because of its strength. Usually they only vary it when the accomodations don't allow it.
As dog said the bulkhead requires proper replacement regardless.
Living aboard in Victoria Harbour