Richard, I checked the SimpleChart widget again (after our last contact) and it seems one of our MVP's, Andries Smit, has created a pull request for the AMD setup back in March last year. It hasn't been pulled in yet.
Anyone who wants to work on this widget? It is Community supported, so I'd like Community members to provide us with the pull requests. I will review the code later this week. If I have time I'll try to code as well.