There doesn't seem to be one yet. Hopefully soon as the LCR seems to be selling well and is proving to be superior to S&Ws answer in their new Bodyguard series from what I have read. J-frame speedloaders are too big for the LCR, though. You can get the bullets into the chambers but you need to shake the revolver a bit to get them to (hopefully) slide down into place.
Not very optimal in the heat of the moment, yes?