The newer kettles are of light gauge enough to bend out dents with your hands (sometimes)...just use you weight and wood pieces to setup a bending platform...then push forcefully /gently and see if you can barehand push it out...
Had a otg gold with a main body part of the lid with a crease dent.....porcelain was solid in the crease...i just put the lid on the grass and kept pushing the crease out with my thumbs...took a little time but it was close to invisible after 25-20 mins