TD. I'm sure a set of stamped steel covers will be lighter than the cast Aluminum that you have had. Easy and cheap to find. The Stamped anodized types are getting a little hard to find these days.
The Moroso stamped Dana rear end covers (Also ultra light) are also getting a little harder to find.
I'm still looking to find the Gold Moroso/Direct Connect anodized timing chain covers. I suspect those are not easy to seal at all, but are ultra-ultra light.

Man, you started this craze with a simple question that we all know is not so simple, don't you have an antidote handy? LOL.