Cherry Pie Bars (From Scratch)

Is it permissible to use preserved cherries that are stored in cans or jars? I advise against using canned cherries in this dish. Canned cherries often include additional additives. If you are able to get a can or jar containing just cherries in liquid, these cherries are already extremely tender and will easily break down when cooked. I strongly advise against them in this context.
Is it OK to substitute sour cherries with dark sweet cherries? Indeed, we have conducted a thorough examination of this and can confirm that it works very well with two modifications: Decrease the amount of sugar in the filling to 1/3 cup (67g) and include an additional 1 teaspoon of lemon juice. However, if I had to make a decision, I would choose for sour cherries in this particular situation.
Is it possible to bake this in a 9×13-inch pan? Yes, it is possible to bake a larger quantity, however I have found that following the original recipe and using a 9-inch square pan yields superior results. To increase the quantity, double the amount of each ingredient by two and bake the mixture in a pan measuring 9×13 inches. Extend the duration of pre-baking the crust to 18 minutes. Extend the duration of baking after incorporating the filling and crumble topping to 1 hour, or until the filling starts to bubble.