T-Connector for 510 Wall Charger?

[PaulB]

I keep a standard 510 wall charger plugged into the 12V socket in my vehicle using the mini-plug connection. Since I switch between Ego (mainly now) and 510, I was wondering if anybody makes a T-connector that would allow me to charge two at once through this charger. I'd put my 510-to-Ego charger adapter in one of the connectors.