I used to have a fancy pants fifth wheel with microwave, oven and 3 burner cooktop. I still hauled along a camp stove and cooked outside.
Check your inside stove and see if it can be removed and mounted on the rail outside. Some did that, some came with two stoves, and some came with a separate shelf. I wouldn't think the rail for the shelf side would be too hard to source. When I had my Coleman popup I used the original slide rail bracket and outside stove and built a larger top so I had more work area.
Just a heads up on using the pop up stove with the bulk tank... don't! They don't have a regulator (it is on the tank at the front) and is a lower pressure than a standard camping stove (I think). I use a regular Coleman LP camp stove on the picnic table for most of my cooking. I have an extension pole (tree)
that fits on a 20# LP cylinder, which sits in a milk crate for stability. I mount a lantern on the top of the tree for lighting. What is really slick is at night right before you go to bed, turn the tank off and leave the lantern on and it will give you several minutes of light as it burns off the propane in the tree.
First picture is our typical camp set up at a nearby State Recreation area. We have water and electricity, no sewer. Bath house is 4-5 sites away. Second picture you can see the two stoves hooked up to the tree. We were providing support for 46 pageant girls that were camping that weekend.
The lady in pink is my bride the other one is one of "our" girls. They are in the process of cooking up 25# of bacon and over 200 pieces of french toast.