I bought a monogram keepall, which had big initials on its side (on the canvas, not the leather handel). I read from here, that an sales person from Louis Vuitton store had suggested using tape to rip the color off.
So I tried and put duck tape on the letters. First in small area if something goes wrong. And it worked! I had to repeat it few times, but now you can't see it. I think mine was painted, cause there is no deep stamp. There is nothing left and the surface didn't suffer at all! I pressed the tape really good and hard on to the area (I used a ruler to get it everywhere) and then pulled it off with one firm and quick pull (like waxing). Some glue of the tape got stuck on the bag but I used a piece of duck tape to get it off (get a little piece of tape, then with the glue side quickly tap around the places with glue and you see it disappears
).
I am very glad now. My own Louis Vuitton sales person told they do not remove initials although I have heard they do it in some stores.
It sounds like you were successful at removing a mon monogram and not a heat stamp if I am reading your post correctly. If this is so would you please be willing to post a picture with the end result? My friend is divorcing and wants to remove the last initial from her mon mono speedy and just keep the first. This sounds like a fabulous option for her. I tried to find the thread that you said you read how to do it on but I just can not seem to find it. Thank you for helping me!