Ya done good!

One idea, and I'm saying this without knowing if he would do it, Check with Mark at Tyger Forge. He makes some beautiful designs in hammered brass, copper, silver,... that he could probably make up a small plate that you could a fix to the flap to hide the snap. He showed me a brooch he made that would be a nice size for your sporran. You can see some of his designs at the Scottish Tartans Museum gift shop.