[idiot mode] Ookay. But when you do the deconverter, as I understand it, it creates a new "tutu conversion" savegame. Which probably won't count as a 'new game' for the purposes of mods that do things like alter worldmaps.
My order of attack goes as follows-
Beat the game in tutu
Delete weidu.log
Run deconverter
Install loads of modzorz (including lots of yours ghrey, if it makes you feel better for me wasting your time)
Run BG2, play at will.
Would it be better to install the BG2 mods after deleting weidu.log (wrecking tutu, probably, but since I'm about to deconvert...)
[/idiot mode]
Normally I'd just try it and see what happens, but I can see it being very tricky to go back to square 1 if it all messes up.