I have the grill on the 30mbar regulator from the motorhome. With the lid on, you can grill well, even if it's not as dynamic as it could be. The aluminium grate needs some time to heat up anyway, regardless of whether it's 30 or 50 mbar.

You will need a gas pressure regulator to 50 mbar, which you can buy separately, e.g. Campingaz Pressure Regulator CGS.