Are you referring to using the threaded sleeve as a spacer? If so, I don't think it's thick enough to work as a spacer. The metal is extremely thin. If i could find a thicker aluminum sleeve to use as a spacer, then I think that would work just fine. The existing ring doesn't interfere as far as clearance goes, but it is unsprung weight. I'll look at it, but I think it would be difficult to remove without a lot of cutting and grinding.
I have my old 240 strut tubes that I could install instead, but I don't know if it would be worth swapping them out.