I purchased the original version of the hand heart for my wife last Valentine's day. She loves it but could not use it as a pendant. We have brought it to a jeweler to have links soldered on so that a chain can be used.
Now, at last, you have created the solution; I wish this had been designed months ago, as I fear the cost of the the jeweler's work may outweigh the purchase of the new Hand heart version.
Still a lovely piece.