The heated pin is a very old trick that works, but you need patience. Tweeters are sealed units, there is no pushing the domes back up, just by taking them out of the units. If anything, I would just contact B&W first before doing anything and see what they say about fixing the damage. Next is then making sure that all parents with children that enter, sign a release waiver, that the party of the first part has every right to slap the party of the second part's child's back of the hand with a ruler.
I have waited almost 16 years to finally invest into a decent system. Of course, I have and will be repeating to my son numerous times about the rules when using dad's system.
I remember when my sister's kid pushed in the domes of my dad's floor speakers, and of course, I being the youngest son and only kid left in the house, got the pleasure of fixing the tweeters. Those speakers lasted our family well over 19 years, due to I also replaced all of the speakers back around 1999 with all new drivers. I know that my nephew still had them after he moved out, so at this point my fair guess is who knows where they went after that.