I don't know if this will help with your DS but it could be worth considering. My DD has found ways to include enrichment on her own. On Friday, for example, her teacher began to tell the class a bit about Rosh Hashanah since they would be having a 3 day weekend. DD asked if she could "research" it over the weekend and present a report to the class when they came back on Tuesday. She said she loved doing this. When I asked if she might want to do more "special reports" she said "That would be great - as long as I get to assign them to myself."
Last year (in first grade) her weekly homework included a list of 5 words and the kids had to write a sentence for each word. Now because of dyslexia and dysgraphia this was nothing short of torture for DD. However about half-way through the year she decided to write on topics instead of writing random sentences. She then had to come up with a way to incorporate these random, unrelated words into a cohesive paragraph. The writing itself was still incredibly difficult but by engaging her mind she was actually able to (almost) enjoy the task.
Could you find ways to slip in enrichment for your DS this way?
