FWIW, I have never been able to get the 504 to include a written statement that DD's workload will be reduced. I've been told multiple times that would be a curriculum modification that requires an IEP. That said, once DD got her 504 which just says that she gets extra time, her teachers often have been willing to modify DD's workload informally.

For example, this year DD's teacher has set time limits on different homework tasks for her. If she doesn't get something done, she may need to work over the weekend if it is something important or it might just be forgiven. The teacher asks me to keep her informed when DD is getting overwhelmed and has given me authority to cut DD off. BTW, did I mention that I think that this year's teacher is a goddess?