I have settled on a look for Ursa. Latex surfaces were too shiny for the dark setting, so I went with a more satin -ultra-tight catsuit for her. A few changes to her makeup and plenty of experiments with skin tone, eye shadow and hair colour. She also has a great pair of high heel boots on that match, although not part of the original outfit.
Despite a height difference, I didn't want there to be too much of a difference between the 2, so most of her advantage is due to her heels and long legs.
I tried to get them in an "Ice-Fortress" setting, but so far haven't been able to make anything work that I find acceptable.