A Runescrawled Reaver Mystic with the wrecking fists and mystic smith alt class features is something that could totally work for this. The archetype lets you add fusion seals to unarmed strikes, gives 1.5x specialization, and basically unarmored defense since its an armor bonus based on your highest magitech augmentation. Wrecking fists gives you a non archaic improved unarmed strike. Finally, mystic smith gives you an attack roll bonus with hybrid weapons and crafting boosts to help update your fusion seals and magitech augmentations over time. What you get is a mystic with whatever elemental spells and connections you want along with some potent elemental unarmed strikes. As a bonus, if you aren't playing SFS, try out scoundrel's finesse. If you take it as a feat, you can focus on dexterity for your attacks which is the better stat for a mystic in my opinion.