For the scientist:
I haven't tried it or smelled it, but Kataniya, The Clockwork Woman in the Carnaval looked a little steampunk. Some of the reviews indicate that it does indeed smell metallic, but of course it depends on your chemistry.
Someone else in the review thread for Kataniya mentioned Bed of Nails (but that is not easy to get!) Neo-Tokyo is mentioned on Scent Scribbles as having a metallic scent but that was discontinued almost a year ago. In fact most of the ones with metallic notes listed on Scent Scribbles are LEs.
Maybe Agnes Nutter? She has rusty nails! gunpowder, charred wood, smoke... maybe a scientist who blows things up? Could always be layered with something.
Togruda gunner:
Hmmm. Enraged Orangutan musk has rainforesty stuff in it. Are Orangutan's considered alien?? "Five dark, aggressive, furious musks with ambergris bouquet, Malaysian rainforest plant extracts, black amber and orange peel."
Machu Picchu is "Sweet tropical fruits burst through deep, wet rainforest boughs, enormous steamy blossoms, over thin mountaintop breezes, mingled with the soft, rich golden scent of Peruvian amber."
Manila is "A tropical, humid, lush scent, with a faint echo of Pacific breezes, jungle blossoms, and deep wet woods. Sampaguita blossoms, banana leaf, palm, and narra."
Let us know what you decide on!