Gregor, shortening your driver 2” will never make it feel anywhere near the same regardless of any weight added to get back the swingweight. However, this does not mean that it may really work out for you. You simply need to try it. The main problems are as you have already guessed; the swingweight drops by 12 and the shaft will feel stiffer. It is really too much lead tape to put on (each swingweight is 2 grams and it takes 5” of lead tape for every 2 grams = 60” of lead tape), but it is doable and probably quite ugly. If you try it, put all the lead tape on the sole as evenly around the face center as possible. Some tape can go on the back if you cannot see it.