K4thos, when people install the iwd in eet mod, they want to play iwd in eet. They want to play with friends and travel there and be able to go back and forth at will at their leisure. If playing alone, they want to take Khalid, Jaheira, Branwen, Viconia, Xzar, Montaron, etc. Over there quickly and see what new banters and interjections you've written.
When they play iwd in eet for a second time, they want to take a new set of BG1 NPCs to IWD and see the new banters and interjections for thise NPCs that they didn't see the first time. Don't force people to beat 1/3 of BG1 before getting to play IWD in EET. Anticipate people wanting to go to IWD immediately and pre-empt requests for tweak options to go to iwd immediately by simply making IWD available immediately.