Kachiko without Yoshimo Options

[Cat]

To be honest, im one of the people, and there are alot of people judging from the few Baldurs Gate players that i know, that truly hates Yoshimo. Of course, that has never been a problem since I at least, never let him join me or at most, leave him to rot the moment im done with Irenicus' dungeon. Now however, i have fallen in love with Kachiko, a wonderful NPC that i think (as you probably realize) is cooler than alot of the original NPC's but im getting more and more frustrated with Yoshimos uselessness. So is there ANY way possible to get rid of him without losing Kachiko?

The closest thing ive come to anything is from Rattledagger's Walkthrough for Tortured Souls stickied here

NOTE: If joining Bodhi in Chapter 3, you must have Yoshimo in your party all the time from before choosing Bodhi till going for Spellhold, since otherwise he disappears and you can't do the main quest... But you can this way manage to have only Kachiko in your party - just remember to kill her before leaving for Spellhold, since otherwise you'll get stuck at the dock.

But
1: That means i have to drag Yoshimo along for as long as to spellhold. Nothing to do earlier?

2: I dont really understand what exactly it is i must do.
Kill Kachiko, then go to spellhold? Then what? Finish spellhold? Go to the 'main quest' ? finish it, come back and get Kachiko? Does yoshimo have to die in spellhold? Or be left in the 'main quest' or what?

Hopefully, thanks beforehand. So far im really enjoying TS