I wouldn't worry about "ease of returning to stock"...make the mod you like and sell the oven on eBay.
A quick look on eBay says you can get $300 or so for your OEM oven. I would replace the over either with an
induction cooktop like this one for about $200 or a
gas cooktop like this one for about $100.
If you like using the induction cooktop, then I would find one that you could build in. If you stay with a gas cooktop, then you can connect to the existing gas line for the stove. Either way, you keep a cooktop and can still make the space below into a cabinet.
We use our oven a fair amount....when we're boondocking without power, it's nice when the weather is bad to make a meatloaf out of the hamburgers, or cook a roast, etc, and stay inside where it's dry instead of braving teh weather to BBQ. Even on nice days, we sometimes make a batch of cookies or brownies after dinner in the oven.
We mostly use the microwave as a breadbox....
At any rate I would sell the oven and make the RV how you like it. Don't worry about returning to OEM, there are plenty of buyers that would love this kind of mod!