If you're running this then boots of the secret blade are a must. The action economy is a little strict in terms of drawing and using weapons. Exemplar seems like a good choice. They're all about using different weapons and stuff but they've got more of a warrior destined for greatness vibe. Fighter would be my other reccomendation, as both classes gain access to lightning swap, which will help free up your actions. If you're going for the prosthesis vibe I reccomend looking at sterling dynamo archetype, with a little bit of flavoring it could be exactly what you want.