If you want to use official GW minis, the Adeptus Mechanicus line would obviously be a good source for your tech-priest type as well as your sniper and possibly the surgeon. Another possibility is the Genestealer Cult range, which has some techie, mad-scientist-looking character minis in it.
For the sniper, there is an old metal Vostroyan sniper miniature which has a bit of an ad-mech feel to it, though you’d have to track it down on the second-hand market.
For the assassin, the Eldar and Dark Eldar lines have a good range of figures wearing bodysuits.
For the psyker, there was an actual female imperial psyker released as part of one of the expansion sets for Blackstone Fortress. OOP now, so it would be another one to find second-hand.
There is a female Genestealer magus model that might do as well, and if you want to emphasise the religious aspect, there’s a few robed figures in the Adeptus Sororitas range that might not look too much like a battle sister with a bit of conversion.
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