Gas oven question

I'm looking for some advice on gas wall ovens. We bought my house about three years ago and it seems the previous owners supplied the house with professional appliances that are slowly dying out. My wall gas oven options panel has broken, keeping us form using the oven and the maker of the oven no longer makes ovens. The oven has vents above and below the oven and the oven is 30". When looking for wall gas ovens at 30.5" wide and a height of 34", which includes the vents, those dementions are impossible to find. What I've read is that many gas ovens have a filter going outside but this one has cents inside. However, my stove, which includes an indoor grill, has a filter going outside.

What are my options to replacing this odd shaped gas oven? Conversion to electric seems pricey. Would I need to have an oven filter linked to the stove one and then fill the oven gap somehow? My home warranty company only gave us $1200 to replace the oven but that doesn't seem like enough to replace this oven.