Yes, the windscreen might need minor modification either to accommodate the burner controls or the pot handle.
Yes, it could be even lighter by using a triangular format for the mesh and/or cutting out some of the mesh in the center (though a triangular format would not fit a four-support system well, whereas the square format is more universally workable).
Also: the 3" square mesh with hooks only weighs 8 grams now, so not much savings to be had (I know, a gram is a gram).
If your stove pot supports have a good place to attach a wire, you can add three wires to support the windscreen. I have tried this with a Pocket Rocket and it works fine, saving the weight of the mesh. The mesh allows this system to fit many available canister stoves without modification. As a product, that is a good thing. I could certainly have a DIY option in which someone would attach wires themselves to their stove. I would ship the wires (with some spares) and the windscreen.
The titanium windscreen is rolled up inside or outside your pot or however you want to roll it. You could also use aluminum, though the titanium is nicer.
I will be adding some things to my product line in late December or January, including a variety of titanium windscreens for all types of stoves, including canister stoves, alcohol stoves, and Esbit stoves. I have just taken a leap of faith with a fairly big order (20 meters) of 0.1 mm thick titanium foil, which is about 25% lighter/thinner than the foil that titanium goat carries. Can you dig it?