Relax is a needed uv tool. You might also try blenders new UV tool, don't know if it has relax.I have only played abit w/ it, but it has alot there. I am definitely hoping the UV in hex is more usable because it would really help to do it in there.Of course, I can say that because I don't model in Carrara :)UV is so essential and kinda annoying so good tools are important.

No need to think outside the box....
    Just make it invisible.