Last year my son's 2nd grade teacher taught her class the ASL (American Sign Language) alphabet so they could practice finger spelling. They would do that when they were in line at the library, etc, & it also kept them quiet. I thought it was a cool idea. Can't vouch for its success since DS is a good speller but it definitely uses another neurological pathway--worth a try! Here's a chart if you don't already know the signs: fingerspelled alphabet

When you're curious, you find lots of interesting things to do. Walt Disney