Problem is, by buying older machines, you’re restricted to older versions of Android and less chance of firmware upgrades. I’m not aware of a CD drive that connects to the Asus TF201 but it did have a keyboard dock, micro SD slot, SD slot and USB and an on-keyboard battery that extended the tablet battery life.
You can get usb sticks to work if you root your tablet and install stickmount, with an OTG cable connected. I don’t think a tablet would put enough power through this connection to power a usb cd rom unless it was externally powered. In which case you’re looking at lots of cables and add-on units so you may as well get a laptop!
You could get a wifi external drive and use a computer to rip everything to this, then connect to it for tunes?