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Older looking versions of the PreCures are in the full colour doujinshi by circle "Studio Mizuyokan" which is titled "All Slaves PreCure".
The doujin was translated and edited by Darknight. The translations involved a lot of redrawing, so there was a lot of effort. It is also a text-heavy doujin. Since Darknight has decensored items in the past, once can hope there will eventually be a decensored version.