I think you should be able to just grab an equivlent x200 off of ebay (possibly with a different wlan card added) - and be safe (as in safe that you can run libreboot, not any guarantees about firmware in all the dark corners, like ethernet card).
I've been considering trying libreboot on my T420s - but as I use it almost every day, it's a bit high risk in case I brick it.
The author of libreboot, and owner of Minifree (former Gluglug) said that he would complete all current orders, so he would mark them as out-of-stock.
You can buy a X200 and free your laptop yourself if you dare :) You can swing by #libreboot on Freenode if you have any interest in the project.