UPDATE
Turns out using MP3tag to remove all the art isn't enough! After trying the SD card in my car yesterday, I noticed that tons of the albums still have album art. For anyone wanting to know how to COMPLETELY remove all traces of the album art, I've written a checklist below (as it took me ages to find out how to rectify this!).
Some notes:
-Most importantly, this is all theoretical for now. I haven't had chance to test this properly but it seems to be working for Dave H! Will feedback after I've done a proper test as I have a lot of driving to do this weekend!
-This is just a temporary fix to get the SD card to work as it should. You should do a backup of everything first to save yourself the hassle of having to reapply album art to everything if/when 0755 is released. If this ever comes out, it should just be a matter of replacing everything on your card with your backup files as they will have the album art still applied.
-Make sure you delete every kind of image file you can think of when following the steps. I thought I hit everything and then found one album on my infotainment system that had a cover. Turns out it was a .gif file of all things!
CHECKLIST
-Do a backup of all your music.
-Use MP3tag to remove all cover art. This removes the art from each song on a surface level.
-Go to the folder with all your music, click View, then Folder Options, hit the View tab. Make sure 'Show hidden files, folders and drives' is selected, and untick 'Hide protected operating system files (Recommended)'. This enables you to weed out all remaining traces of album art that wasn't hit by MP3tag.
-Do a search in the music folder for .jpg, .jpeg, .gif etc. Basically any image extensions. Make sure it's just stuff from the music folder that you won't need as some deleting is going to happen!
-Delete everything that comes up in the search.
-Enter the SD card into the infotainment system and do a thorough check to ensure that none of the albums have covers. The quickest way to do this is to press the album itself when music is playing and the database has updated (usually takes 5-10 minutes after inserting the card). This is will show the entirety of your music library that you can scroll through using the dial on the right.
-If anything is amiss, go back to the computer and follow the previous steps.
-If all is well, sit back, relax, and enjoy your tunes the way they were meant to be enjoyed!
Will update after a few days. For this, I'm using a 128GB Toshiba Exceria Class 3 SDXC Card formatted as FAT32. Hopefully I'll be coming back with good news!