In pathfinder this is doable, in dnd there is usually a hard rule where multiple bonus actions are impossible even if it would normal logic dictated otherwise. However BG3 breaks all the rules as one of the exceptions in game is Astarion who can dash twice, or disengage twice per turn as bonus action. As the above poster said, we just do not know enough yet.
Now let's assume that you can infact do that. Would it be competitive build? My answer is definite NO. You would be better of taking 2 fighter for action surge, and then casting haste with a scroll. To allow your level 10 sorc to cast a twined metamagic spell and cast two Milef Minute meteors for 12d6 *2 + fireball action surge, and use twined cone of cold for 8d8, and then hit again with disintegrate for 21d6. This combo is way stronger then any Rogue sorc combo if my math is correct
