Lee,
Coupla answers:
1) First, the MIDI-only route: hHave you considered just having the computer software record the MIDI output of your K? That's what I do in cases like this. Say I've sketched out a song on the K's internal sequencer. I'll open my software (Logic, in this case) and set it up to record MIDI. Then I'll hit "record" in Logic and "play" on the Kurz. Logic will (if you tell it to) pick up the appropriate tempo, and record all the MIDI (the Kurz will transmit the MIDI as well as playing the Audio when you hit Play). Then I've got a MIDI representation of the Kurz song in my sequencer in the computer. Easy as Pie.
1a) You can also hit "dump" on the Kurz to dump the song and record that in your computer sequener, does the same thing
1b) You can have your Kurz save the song as a .MID file (MIDI file), put that on a SCIS drive or a (ick) floppy, and load that into your sequencer.
This gives you a great deal of flexibility. Your Kurz sequencer has sent the exact MIDI it uses internally to your computer seqnecer, so you have the idential thing to play back to your Kurz. You can then modify, etc. to your hearts content.
2) The Audio route: If you want to just record each track as audio then sync them, that is pretty strightforward too, since you're
only using the Kurz. Just do it. Record each track on it's own audio track in your computer seqnecer, one at a time.
Since you're using the same audio software and the same Kurzweil,
without touching tempo on each at any time, you'll get equal-length recrodings. Just line up the front edges (basically) and you'll be aligned without having to click-track. Really, try it, you'll see it will be easy.
The challenge in doing this is when you're using different external instruments that aren't synced with each other. But if it's all coming from the Kurz, each of the 8 tracks will start at the same time, be at the same tempo, and fill the same track length.
If you do want to add a one-bar click track to the front (just cuz you hate me and don't trust me

) that's easy to do too.
Make a new SONG on your Kurz. Record one bar of clicking (either using the 198 (I think)) click sound, or a drum kit. Quantitize it with the Kurz sequence editor so ti's right on the quarter notes (easy).
Now, go make another SONG. This song will jsut be a chaining arrange song.
Have that song start with the click SONG, then the next semenget will be the "real" SONG.
Read up on the ARRANG function in the Kurz book for clarity on this (I think I mention it in one of my sample songs on my web site, too).
So whichever way you go, recording MIDI or Audio, you'll find that it's easier than you think, you'll be pleasantly suprised. If any of this was not clear, let me know and I'll be more detailed.