First of all I'd like to command you for sticking to your content policy and doing your best to fit with Apple's, honestly quite puritan sounding values.
A lot fo creators are drawn to tapas because of the very freedom of exploring those themes. I know I personally considered multiple platforms before settling here, simply because my series has some darker themes and I didn't want to be tone policed by the platform I'm using.
While it's a shame those series won't appear in the iOS searches anymore, I think it's the most viable compromise for now. Unless Apple decides to be more lenient, which doesn't sound likely.