I just tried this mod

http://www.nexusmods.com/morrowind/mods/6040

But it crashes just after I say "yes" to the "mysterious stranger" near Sadrith Mora who asks me whether I am interested in the magic chalice which opens the door. I thought it was a conflict with some other mod, but it happens even if I deactivate all other mods and then modify the master files list and clean the save.

I think probably it was done with a pre-Bloodmoon, more syntax-tolerant Morrowind engine.

if you know how to edit in CS and keep the mod clean from GMST,

in greeting1, info id 1041316032805716346 for Drow Alivarason "Then meet me in Castlevania's Chapel, which is reached..."

the dialog result line

->PositionCell 950,538,-510,90,"Castlevania Chapel"

should be replaced by

PositionCell 950,538,-510,90,"Castlevania Chapel"

else open the in game console and type (enter key after each line):

Journal Dr_Doom_Door_01 1
"Drow Alivarason"->PositionCell 950 538 -510 90 "Castlevania Chapel"

then you can look for Castlevania's Chapel, quest should be started and NPC should be there

Unfortunately, the first method doesn't work. The second one is working though if I disable the npc, and then enable him in the chapel. If I try to teleport him without disabling, the game crashes. Maybe it's because my game is patched? In Wrye Mash this mod is yellow at the beginning, not green as others, so some error is already present. It becomes green after I repair the master file list.