How about an animated sequel to PGSM, but w/ a brand new, original story, i.e. not an adaptation of the Black Moon arc? The live-action sequel Special Act is already an original story, & the animated sequel could set after it, i.e. the Senshi would all be adults, be married, &/or have children (Usagi & Mamoru had already got married at the end of that Act, in which there'd already been subtle hints that she was at her early stage of pregnancy at the time, too).