An intelligence penalty might make it harder for them to imagine what is happening, but Sense Motive and will saves are Wisdom based.
I agree with altpersona and awaken DM golem on the diplomancy part. It truly is your easiest (non-pun-pun) path.
Take one level in Binder (for Naberious), cleric (for Mind and Herald domains), marshal (for skill focus diplomacy, and motivate charisma aura). As a DFA, you can pick up Beguiling Influence.
Aren't Kobolds inately subservient to true dragons in general? As a Kobold, you did take Dragonwrought, right? Establish yourself as their leader, and kobolds should be all you need.
Thralherd is just awesome in general... have your believers labor to raise the funds to pay for simulacrum scrolls, then pop clones of yourself with thrallherd control quotas of their own. It's the gift that keeps on giving.