AHK insert welded – remove again

Hi, everybody, I signed for my new flicker on Friday. He has a fixed AHK. So he welded the US-Bock and the slot. On the photo you can see this from above. I absolutely don’t need the AHK, so it should go away again. Does anyone have experience there? Work the welding seam with an angle grinder until the part goes off again? Thank you in advance.