Welcome here if I haven't said so !!!!!
Don't recall anyone doing that particular combination of gas / charcoal setup yet, but maybe..................you may be the first !!!
Most folks have done something along the lines of a larger hole, sitting on some type of hook or prop-up to the lower edge of the bell......like these on the underside of the table as a possibility.....
Basic concern is usually that's a lot of weight w/ charcoal & meat, plus the weight of the kettle all resting on the handles..................
A few have done setups where the kettle's legs stay on & it can be removed for separate use