Solutions sought for my first world dilemma.

I currently subscribe to Tidal HiFi (£19.99 a month) for 'serious listening' and downloads, and Spotify £9.99 for its wider catalogue and because KidA has playlists on her Echo to help her sleep.

So far so good, but TIDAL doesn't yet integrate with Amazon Echo in the UK, and so if KidA is listening to her playlist and we want to hear other stuff online we're screwed. Further. KidB is about to get an Echo, and no doubt she'll want to listen to her own stuff. So some sort of family account feels inevitable.

So what are my options?

I could easily solve with a Spotify family account + Tidal. But them I'm spending £35 a month on music subs, which starts to feel expensive.
I could switch to Amazon HD family (£15) but I don't think that integrates with LMS, which I use to serve music to the proper system (using a NAS and Picore). Is there another software option to stream local music and Amazon?

What would you do?