I'd suggest either Zoe and Pi-Well or Carlotta Kowalsky from the Infinity Nomad range for Laureline.
Zoe is an older sculpt:
Carlotta looks ready to murderate someone:
For a more lightly armed lady, there's the Szalamandra pilot:
Now, for Valerian, you could try the Vortex Spec-Ops, Moran Maasai, or just about any of the helmeted troopers if you can find a headswap the right size. Sadly, the Wildcat models will NOT work, they're rather puny sculpts…
Vortex:
Moran Maasai:
There is a guy in the UK who will do split-boxes of Infinity models, just the model you want out of a box, though if the rest of the models in the box aren't selling well you may have trouble getting that specific model. link
The Alguacile w/ cornrows from Op Icestorm wouldn't be a bad model to use, for example. Go to the Infinity photo catalogue to see what models you can find: catalog.infinitythegame.com
And it looks like Bombshell minis sells separate helmet bubbles, too!