The ergonomic grips work for me because I can set them so that the flat bit supports the base of my hand, thus moving pressure from the bit where the bars go, but I can't see that working with a bar that's fore and aft like the moustachebars, though they might be worth a try. Hell, anything is worth a try if it eases hand numbness.
For the record, I don't have a lot of pressure on my hands now either (thanks to enlightened bike set up), but it's still a problem for me.
Richard