I found some titanium ones on ebay!! Not sure on the weight though. The aluminum nut on my ip265 is less than 8 grams. I am still happy to have something to try that is not steel (49grams).
I will still be looking for a aluminum nut but now I am not in such a rush.
Thanks for the idea Vipassana. My wife just quit as GM of a aerospace machine shop
. She has a lot of connections with shops that could do the work. I just thought I would be able to find something easily, WRONG.