AUDIOPHONICS I-Sabre V3 DAC ES9023 TCXO

[Skywatch]

That is something I am about to try.

At the moment I have one pi2 with pifi digi for 5.1 sound and another pi2 with dac for music. It may be possible to have both digi and dac connected to one pi, but even if that works I will still need to turn on and off passthrough in kodi and reboot with the appropriate dtoverlay to switch between the two. Not ideal.

Your goal should be much easier! AFAIK you cannot have audio routed to the I2S dac and hdmi at the same time (ie both playing together) but you can simply go into kodi system menu and select the output you want (hdmi for film or alsa for dac) without rebooting or changing anything as the I2S and HDMI both only have one device attached...