I did ask Station to search your books for examples of your languages, but the word list was painfully short. I would be pleased with either method of learning the languages. Some time spent with an auditory connection would be good, so as to get a firmer grasp on pronunciation.
Humans generally do not start having such skills. You could learn them if you wish. They require no special skills, simply a willingness to do work some may prefer to avoid. That usually depends on how thoroughly the previous person was doing their job. As for metal work, I do not anticipate a need for magical assistance, but I will keep it in mind.
Hands have particular significance in Radchaai culture, including spiritually. That the significance continues into the language is not surprising. But then it is my first language. I may be biased.