No plans to release it elsewhere as far as I know. It's available on DLsite and in Japanese and that's it for now.
Yeah, I think people that weren't already invested in the writing quality from the previous games just used MTL, and everyone else is holding off because unko morimori maru has phenomenally good writing and we want a translation that preserves that writing quality and the puns and jokes, which are often hard for ordinary translation, let alone MTL. The problem is the level of work to do a quality translation at that level for a longer game like this seems to have scared off all the fan translators who might have otherwise done it.