My gut reaction is to inquire at Lodge if any of the other Brothers have experience. It may save you some odd looks or questions if there is a president already set within your Lodge's members.

On the other hand, I would tend towards removing the sporran while the Lodge is tiled. Proper reverence for the business being done is often helped when one looks like they mean business.

I'll ask a few kilt wearing Mason's their thoughts tonight if I get the chance. I'm on my way to a convention for the Ohio Grotto Association right now and I know at least 5 or 6 of the guys there wear kilts regularly.