[adrianmonk]

Or I guess you might have been able to do a scriptable method that does involve re-ripping.

That is, stick a CD-RW in the drive, and write a program that would:

(1) Erase the CD-RW, then burn one album's worth of WAV files to it. (Ideally, do it accurately like with a cue sheet file.)

(2) Drive the Apple software's GUI (using AppleScript?) to enter the track metadata, re-rip, and upload.

(3) Repeat until done.

If something ejects the CD-RW, that might mess up the automation. Some drives will pull the CD back in if the tray or disc bumps into something while ejecting, so maybe a strategically-placed heavy object is enough.