I hadn't thought about adding a curve or using bar tacks, I'll try it with heavier denim and see how it holds upOf course you can, it's a much cleaner look, but you'll need to be careful. Use a sturdy pocket lining to avoid sag, use bar tacks for reinforcement and add a curve to the opening for better access. I'd also recommend to use a heavier denim to make it easier for you.
That's a great idea, especially testing it out on scraps first, I hadn't considered welt or slit pockets, it might actually be perfect for the cleaner look I'm afterYou could try a welt pocket or a slit pocket. Most dress pants have welt pockets on the back. Slit pockets are usually on a seam, like a jacket has.
Take scraps from cutting out your jeans and make 1/2 a yoke and a partial seat piece and try it. You will need to do the (gold) top stitching of the yoke where the pocket is when constructing the pocket, then do the rest of the yoke top stitch later, when finishing the back.