How? Near enough no one was using the Kunrei system for any of that. If anything this will make it more consistent or at least no worse. Macrons are the biggest inconsistency but that’s always been the case.

It was either Hepburn, the English title (i.e. rock instead of rokku), or just most sensibly kana/kanji that would have been used for this everywhere, never other romanisation systems, to within a rounding error.

Elaborate? I’m not following.