That's right, the burden of proof is only applicable if you want to convince someone that you're right. That's exactly what an argument is. If you're not interested in convincing me that you're right, then you have no argument, including the Kalam. The moment you put forth the Kalam, you're trying to convince me that the Kalam is true. That's your contractual obligation to prove those claims. If you don't care if anyone accepts the Kalam as true, then that's fine, don't back up your claims, but remember that you lose your right to claim that the Kalam is true.
As long as you're putting forth some argument, like the Kalam, you're taking on the burden of proof.