Orange Pi would be interesting. The Allwinner H3 at least has an audio codec built in. I think the audio IO is exposed at least on some Orange Pis. Maybe the audio isn’t as good, maybe it is, but I reckon few people could tell the difference. It would save a lot of hassle and money potentially. I know the minimal Orange Pi Zero has exposed line out and microphone pins, but no line in.
Also, how about this for a touch only Zynthian! https://raspad.sunfounder.com/