SIT UPRIGHT DUTCH STYLE BIKE HANDLEBARS WIDE COMFORT LIFESTYLE 70mm RISE 600mm

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You could keep the shifters/brake levers in the same position as they are now but this would be a disadvantage since you will have to change hand positions to be able to reach them (especially problematic when you have to brake suddenly) assuming your hands are on the top of the bars and not near the shifters/brakes. It used to be quite common to see bikes with "drop" handlebars turned upside-down, to provide a posture similar to what you seek, and I have seen other bikes where "longhorn" bars were installed in place of drops.

When you brake on the swept back bars, your hands are not pushed into the bar, as is the case with drop bars and (relatively) straight bars. I am surly free to install any handle bar on my bike that I want, tough I am interested why people don't do it, or rather what are the arguments against a curved handlebar. I currently have a cheap, battered down touring bike that is nevertheless doing the job surprisingly well, and I think it can work for quite some time more with the proper maintenance. To me (and, I think, most cylists), a touring bike is a drop-handlebar bike similar to a racing bike, but with more relaxed geometry, mounts for racks and fenders, and longer seat-stays so that your heels don't hit your panniers. I think we all have our sweet spot, and it's nice that there are so many variations to choose from these days.

That said, I wasn't aware that there's such amount of different handlebar diameters (with models differing to fractions of a mm). There are variations, from the wide flared bars like the Nitto Albatross, to North Roads to porteur handlebars.

I did consider bars like what you described, but I went with what has been working for me on the other two bikes. Having experimented recently with drop bars, trekking bars (of a sort) and upright bars (Albatross shape), one observation I have is a caution for those who still ride at speed regarding braking with the swept bars. There are plenty of ways to set up drop bar levers such that they are awkward to use, and reach can be an issue.

Using dutch style handlebars is definitely an option but depending on your needs you might still need to increase the stem height (adjust it if there is extra length left or replace it if it's already at or near its extension limit).