I looks like the optimal combo is Biotech-Biochem-Diplomacy. UWT is fine, but many of the components you'll need come from Diplomacy, a dozen out of the forty-two you'll need (there are also two raid-drop items).
You can buy them, of course, and they're not part of the recommended grind to 400 from the excellent SWOTOR Crafting Guide.xlsx, but if 12/42 items used in the craft are from Diplomacy, I'd have to recommend it, and that's what I plan to take fwiw.