Sluissi are more mechanics, Omwati have technical aptitude, similar but different.
You could probably make the initial stat adjustments, and copy the Sluissi's Special Ability to Education, and have Technical Aptitude, same as Practiced Mechanic, but again replacing with Education.
I chose Education, as it is an all-rounder skill, and seems to fit with what you are looking for acc ording to this:
"Typically, this includes at least a basic grounding in the mathematics, the basic sciences, and enough understanding of engineering principles to perform basic repairs." [Edge of the Empire, page 123]
Edited by MjollnirAU
The more detailed description has the following under the title Exception test: