Oh for f's sake !
Of all the bad ideas anyone could ever possibly have !
No ! For the love of god ! Dont remake old game classics !
Make new stuff. Larian clearly has the skill to do so. So thats what they absolutely should focus on.
So please leave remakes to untalented companies who cant do better anyway.
By the way neither BG1 nor BG2 have been good because of their main story. Sarevok was just a dull brute who for good reason never showed up until the very end and Irenicus was absolutely boring as a character when you think about it, even if the speaker was friggin awesome and really sold the character.
The reason I love BG1 and BG2 are the great quests, the great characters, the great speakers, and of course the great magic system. And yes the many odd quirks of AD&D, too. Like percentile strength for example. So hilarious. Stupid, but hilarious.
Main story ? Meh.