we had a 16 that was about that age when I first saw the bow tangs starting to fail
I turned the boat upside down and filled the channel under the hull join/lip with glass/resin tapering out about 300mm back on each side. Ooops, some carbon may have fallen in there too.
If you do this, put a greased bolt or something throught the bow tang hole first so that the fibres go either either side of it. Then, when you put a longer bolt in the bow tangs, you don't drill through all the reinforcing that you just did.

I can't believe that you can't find a second hand spinny in the netherlands! we have got a decent one and a trashed one here if you like. make me an offer