I've been working on a mod for K1 that allows you to take Bastilla onto Korriban AND take party members into the tomb of Naga Sadow. I need to test this but I don't have a save anywhere near Korriban, so if you would be interested in testing this. PM me.
I don't mean to put a damper on your work, but isn't there already a mod that does this? Not that it matters that there are similar mods. I'm not sure, but would warping to the area work?
Have you tried looking at the saves available here?
Might have the one you need.
Warping would work
there is a mod that allows you to take bastilla on korriban
there isnt a mod that lets you go into his tomb with party members.
There is a mod for taking bastilla on Korriban, but it doens't edit her dialog so that she doens't say to leave her their. It also restores some line from the rest of the party.