I don't think they made alloy ultra shift levers in 11spd.
I would be tempted to buy a set of alloy shifters and swap out the brake blade and shift lever. Then resell the "new" ones with the carbon blades. I looked at swapping centaur alloy brake blades to Athena shifters when they first came out.
They used to sell the spare parts loose in 10spd but I am not sure they still do