PCP and multiple LMS instances

Hi.

I'm new on here, so be gentle :).

I'm planning a Squeezebox Touch replacement based on a RPi 3B and PCP. I already have LMS running on a NAS in the house.

I would like to make the device portable and able to play music off a USB stick when I am not connected to the home network. Is it possible to set PCP to use the home network instance of LMS when connected but use a local instance of LMS accessing music data on a USB stick. (Or alternatively using the USB stick solution as a default if one is present, but try and access the network LMS if not?

Thanks for any help - just want to know if easy to do or whether it will require a lot of work at this stage.