Convince the dwarves that you are a dwarf. It will be difficult, certainly, but it is what you have trained your whole life to do.
This is a wonderful idea! Why didn't you think of this sooner. You were going to wait for a goblin siege but that could take a very long time.
You try to be a dwarf and fail because you are a kobold. You wish you were as tall and broad as a dwarf. They have such wonderful beards and make such beautiful daggers. If you can make a disguise you are sure you will blend right in. You start by using your loin cloth as a fake beard.