Suggestion:
Place the desired gradient colors at the end of the color styles list, and note the index of the first gradient color. If there were say 10 colors before the gradient start style, their indexes would be 0 thru 9, and the style index of the first gradient color would be 10, due to zero indexing.
Edit the script to start at style index 10. If gradient colors run out, reset index to 10.
Or a Moi script with .htm could be written...
- Brian