Can already master 2 tech disciplines and be Expert at Guns & Persuasion
Dwarf + Sickly + Theurapetics:
1) Int to 17
2) Potion to int 19, max Theurapetics, max Gunsmithing
3) 2 into Guns, you're dwarf so 2.1 = Expert
4) 2 into Persuasion (Charisma pot/blessing), potion of Persuasion to 2.1 = Expert
Doable at level ~15.
For backstabbing:
electric rings x2 +4 Dex
magnus gloves (dwarf) +2 dex
potion +2 dex
high level potion + mega potion +2&+2 dex (I usually just use basic one tho)
&Balanced Sword
pretty fast dwarf techno stabber. Ignore Dodge, you won't need it, just Melee & Backstab.
Potion of Haste works even for 100 tech aptitude. Welcome in the world (resisted making Jojo reference here) of 100 damage per fraction of AP which Harm mastors can never even approach. (not to mention Harm is not even the most effective spell, Lightning Bolt actually is).
Arguably this is not so dirty as mage backstabber, but Theurapetics is about +6 or more to all stats which makes it inherently more flexible (because Mages can't increase their mental stats, unlike Techies - essence of INT works for or minute or something like that but that's it).
tl;dr play techie > take Theurapetics, without it Techies are gimped because that discipline returns points invested into schematic making while buffing techie in combat to the point of reaching reasonable amount of shots and having enough strength to use guns.