Hey, and welcome to DC.
I don't have a gas grill, but maybe you should check with a propane gas dealer that also sells grills to see if such a part exist. Also the manufacturer of your grill may be of help. Obviously, when altering gas appliances, the primary concern should be saftey!
Have fun & be careful!
There is only one Quality worse than Hardness of Heart, and that is Softness of Head.
Kool-Aid...Think Before You Drink