Hello,
Our boat is a Classic 35, so similar in size to yours. We have 60m of 8mm chain. This was made up by adding 15m of calibrated chain to the existing 45m original. I used a Crosby C-link (as described by Vyv Cox here: http://coxeng.co.uk/anchoring/c-links/) which was easy to assemble. This works very well for our set up (West Country cruising).
Admittedly, we have never had to anchor in a hurricane… but all things considered, I am happy with the solution. The link goes easily over the gypsy, and there is no sign of corrosion on it.
Hope that helps.
Pietro
The membership association for owners of Dufour Yachts