I'd like to see some of the least engie used skills into something called Legions.
I would replace the holomode for an energy bar that allow you to summon robot/cyborg legions; or instead replace the alchemy/potions, spec/utilities, accordingly; which is the least to do with engineering, being more of a chemistry scientist thing, with a sort of cyborg ish legions with various functions.
For instance, having in...
US 1 - Summon a winged small robot, that follows you until energy is depleted or until slayed in battle. This robot heals you and nearby allies.
US 2 - Summon 3 floating humanoid cyborgs that would have flaming turbines as feet; with swords. Function to attack at will.
US 3 - Summon 3 Spider Like shaped cyborg/robots with shields, that would shield incoming attacks.
US 4 - Summon Kamikaze roller bettles robots, every few seconds until energy is depleted that target foes and explode on impact.
Elite Skill - Summon a winged Fiend like robot that attacks foes, and uses a powerful multi missile attack that targets all foes in nearby area.
I think spawning robots or cyborgs is more of an engineer thing than alchemy.