Answered my own question (Thanks AltaVista!). Following this method listed here :
The third command under Step 1 ended up working:
mount -o ro,notreelog,nologreplay /dev/sdX1 /x
Now, I'm currently watching MC copy everything from the X mount to a restore folder on my array. Going to reformat the unmountable SSD and copy everything back. Whole process taught me about MC. I was using the Krusader docker UI previously.
Guess I'm glad I didn't stripe the two cache drives to get more space a few weeks ago...