Assuming that the floor is carpeted, you can make a spray using a fabric softener (1 to 5 dilution) and spray it on the carpet and let dry. There are also commercial product anti-static sprays available as well. You can search Amazon for them. That should help.
I would avoid using the ground lug on any of your equipment to disipate the static charge. In most cases, it is no different than touching the face plate, etc. (and you definitely don't want to send a high voltage static charge into you cartridge.)
And logic tells me using the same grounding path of a AC outlet would be potentially dangerous. The ground wire at the outlet is there for safety incase there is a fault or short at the outlet.