If anyone is up for trying this 64bit package i built for my phone, it allows Hutspot (from Chum) to control Librespot via the Systemd service and i successfully registered my credentials in Hutspot also which get cached, so you should only need to register your credentials once.
Hopefully it works okay for others, but if not let me know
Ps. if you need to change any configuration they are in the service file (/usr/lib/systemd/user/librespot.service)