Jill, I've had success with a streamlined process I call action mapping. You can get an overview of it here:
Basically, it's a way to get everyone focused not on the content but on the behaviors they want people to take. It happens in 4 steps. The first 2 can take place in a meeting of about 2 hours that includes the client, the main SME, and any other stakeholders who have veto power over what you might want to do.
1. Identify the measurable improvement you want to see in business performance as a result of the training (e.g. "Increase widget sales X% by Q4").
2. Identify what people need to do to achieve that increase and why they aren't doing it. (these become your objectives)
3. Brainstorm realistic activities that will help people practice the necessary actions. These are often scenarios of some sort.
4. Finally, identify the information that learners absolutely need to have in order to complete the activities. This might best be provided as real-world job aids instead of info presented in the course.
Ideally, because they're involved in 1 & 2, everyone buys in to the idea that we're changing behavior, not dumping information. Then the SME can help brainstorm challenging activities and, with luck, becomes less fixated on presenting information.
All this can be done in a big mind map. If you use mind mapping software that lets you insert files, you can attach content to your activity ideas right in the map. The map identifies your content, and you use it as a guide to write your storyboard.
I hope this helps!