Sadie, if you read the threads about deflasking Paphs, you just do these the same way. They look *very* ready to me: roots are crawling around on the bottom, crowns have reached the top.
As far as the CHC goes, make absolutely sure to soak for several hours, rinse, soak for several hours, rinse, about four or five times before using it. Jane's trick is to zap it in the microwave to soften it and get it to absorb water faster. You're trying to not only get rid of salt, but excess tannins. You'll know when it's ready because your soak water will pour off a very light shade of tan rather than the deep red you'll notice right at first.
The first few weeks can be really touchy--make absolutely sure they don't dry out, but don't keep them soggy-sopping. Wet-dry cycles can kill them. Since you're going agar-on, mold will probably build up around the seedlings, so just be aware of that, and if it starts looking too "prolific," carefully pull and wipe it away. If you can fit enough CHC on top of the agar between and around each plant, the mold tends not to be so bad.
How exciting for you! Be sure to post pics of the compot!