You basically have three options:
1) Keep armormech. Use this to suppliment any gear you may need. Mostly, use the craft to sell armor and make money. With this money, buy whatever else you may need.
2) Drop armormech, and pick up synthweaving. Your companion can then use what you craft. It may be easier to drop a craft at 100 rather than 400 (the max I think).
3) Make a new character with synthweaving. This way, you get both crafts.