The following should work on the sonicTransporter but as it hasn’t been confirmed to work yet, let me know how it goes.
If you are running SonicOrbiter version 2.7 or later you should be able to install the Roon Extension Manager.
When that is done you can open the Extension Manager via Settings→Extensions on your Roon Remote and install the CD Ripper extension from the Tools category.
During installation you have to supply the device path of the external drive in the Docker Install Options, this is typically something like /dev/sr0 or /dev/sr1. I don’t know what is the easiest way to determine this on the sonicTransporter (do you have ssh access?), maybe @agillis can give us a hint.
You use ssh (secure shell) to login to a device on the local network from e.g. you laptop, once connected you can give commands to the device. Question is if this service is enabled on the sonicTransporter.