Right, if a jeweler has the skill to do it, it should be pretty easy for them to smooth down the knobs. they would not make them flat as if from years of wear, but could smooth them down so they are not so “knobby”. If not, then you will hear stuff like “we can’t do that” or better yet, “you don’t want to do that” or just plain ”no”.
Can you show a pic of the remade prongs from the side? The stone is beautiful and it looks very at home in the setting.