Abmittedly all this would be a lot of work to implement but we're talking pie in the sky here.

- Skulljack makes organics (Advent but also Sneks and possibly Sects/Muttons) go Unconscious instead of ded
- Unconscious enemies can be carried back and extracted to the Avenger
- Those enemies can have their implants reprogrammed as a Proving Grounds project. Reprogrammed enemies show up in the barracks with access to their original gear (needs to be done for each unit, maybe individually or once per type)
- Converted units either keep their original skills or regain them by ranking up on a dedicated Skill Tree. Possibly a combination of both : start up with the skills they had before conversion, and develop more with experience

- Mech units would be acquired by either extracting a temporarily hacked unit and then reprogramming it in Proving Grounds, or straight up rebuilding them out of wrecks (which should be more expensive).
- Ideally they would also have their original weapons and skills, but I don't think they need to/should gain new stuff through XP. Upgrades in the PG and/or tied to research and other projects (advanced explosives boosts micro missiles, etc) would be nice though.