I wanted basically the same set up as what you have described but could not find it "off the shelf". I am 72, live in a very hilly area but did not want to ride a mountain bike. My cure was a Cannondale Quick 3, 2019, that I had the rear cogs changed to 11-36 and the flat bars changed to what is referred to as mustache bars and added vertical grips for additional hand placement. The crank is a 50/34 so I still have the potential for top end speed but with the 36/34 combo I can make it up my hills without killing my old knees. I added a photo of the new bars with the stock grips. I may change them out later but I need more time in the saddle before I make that decision. I ride Cannondale but what I did can be done to any make hybrid or fitness bike. As a side note, when the stock tires, 28's, wore out I tried 37's. Will be going back to 28' or maybe 32's but not 37's again. Just my opinion.
Be safe, Frank.

Before and after and before I installed the vertical grips on the mustache bars.