Homey streaming to airplay?

Did anyone find a way to stream to airplay?

My setup is an airport express, via toslink to a Class A mini-DAC connected to the speakers.
Great sound works great with ios devices, but cant get it to work with homey

I searched the forum but only found a discontinued airplay client.
Searching the net I found “airserver” but wouldnt know how to get that running homey.

The other way around (streaming apple music to a device like chromecast) would also be OK but seems even harder. (Optical out is a requirement!)