Thanks for the query Michael
C6.1.3 c(i) only allows tape to be used for the specified purposes; use on the end of the boom to make the clew strap slide easier is NOT one of those permitted purposes. Further, "tape" does not include Mylar or other similar material to make the clew strap slide.
C.6..1.3.a allows you to polish the area. C.6.1.3.b allows you to use lubricant on the area. Those are the only permitted ways that you can use.
Happy sailing
David