On the subject of brogues (wing tips) I managed to forget mine on a trip and went to an upscale shop to get a pair. I whimped out because they were too skinny in the toe and were over $200. I was going back to my hotel and drove by an outlet mall. There I found perfect all leather wing tips for $40 that put my expensive shoes to shame for comfort and value.

I would suggest that you move the left strap in an appropriate amount and the right buckles back the same distance and you won't need the belt to hold your kilt up. I've done it on a couple kilts and it usually takes about 5 minutes per strap. O'Neille