I think both of those are great ideas.
Those 2 professions have so few recipes (i hear), and my 59 weaponsmith produces nothing worth selling.
I will also mention that this would be PERFECT FOR ME personally (so this is selfish hehe) I have a Woodworker and weaponsmith, both incredibly hard to level, but something to do in down time. I wish I had a carpenter and armorer, but i don't have the patience to level those with so few recipes.
I would be happy just changing my weaponsmith to basically anything else I don't have because they are so useless.