Copy over the sine wave path to Illustrator, throw away all copied objects but the sine wave path there and reduce the sine wave path to the following form as a preparation for a new pattern brush:
 Create a new pattern brush from the reduced pattern:
 Apply it to a shape you do in Illustrator or you copied over from InDesign:
 Copy/paste that object from Illustrator to your InDesign layout:
@supernaut_au, I totally understand your point. But then we have no other option to reach to the decision makers. Opening up a new request would also not make much of a difference according to my assessment.