My personal advice? If you haven't started the Surprise Torrent by now, don't! Wait until it's not a surprise. I suspect what will happen is that a whole bunch of us will finish, the password will be published, we'll un-RAR the thing, burn it, and delete the original RAR -- thus dropping the traffic to near-zero. Once the surprise is not a surprise, then there should be a new torrent that isn't a RAR, and has an NFO, etc. Or, I guess some people will have to keep it as a RAR? I think these post-surprise scenarios haven't been thoroughly thought-out. We'll see, though, I guess!
I dunno how much longer I will want to keep seeding for the Isomix trilogy, but I will certainly keep it going as long as it takes for you to finish, RB.