Heated seat kit and relay wiring

I'm going to wire it with a relay using the cigarette lighter as the switch to power up everything.  I am still going to use the switch that came with the heated seat kit, except now it will only work with the key turned on.  I realze I can use the ignition wire for power and achieve the same thing, but I do not like hacking into this wire, I'm going to save the hacking for when I install the remote start/alarm. 

Thanks for all the replies.