You see, here's a couple of things. First off, in order to execute a sentence, in order to even pass judgement and enforce law, vampires as a society have to have some sort of structure. The fact is, when it comes to immortal being with amazing powers, there's little if any form of government among them. Now, if you have a family or coven or some kind of sect with a ruler and an army or followers... then such a punishment could be carried out and enforced. however, most small groups of vampires, if they consider themselves a structured society, are not going to bother capturing and maiming another vampire. And who's to say their target wouldn't be vengeful? wouldn't one day acquire enough power to exact revenge, or hell, wouldn't just take the damn mouth stitches out? Seriously.
Vampires could certainly get themselves killed if they mess with the wrong clan or coven. I know for a fact any organized group is going to be able to kill an individual. It might therefore be best to stick to a group for protection, hence families or covens.
The last point is, trying to rp without being able to speak is a frank biatch. I have tried it. What happens is, you get left behind and forgotten about. Take my advice and don't do it. Those who can't read minds will find him especially useless and will avoid rping with your dude.