How about a piece of stainless for the latch? It may add some ounces though.
I did consider that but as I feel quite comfortable working the composite latch, I went that route.
The heavy'er weight would not concerned me. What always is a concern when mixing alloys and composites are two main areas. Bonding and galvanic corrosion.
Granted..... you could bolt the latch to the lid and stainless is one of the least susceptible alloys to cause galvanic corrosion.
But instead I wants to distribute the pressure load via a wide plate bonded to the lid. This way the whole lid acts as part of the structure rather than just a few bolts.
This will be much stronger and lighter. What I have now is just the beginning.
You'll see.....