Hydraulic brakes = disc brakes, and that frame was not designed for discs.

2x11 doesn’t offer any advantages over 3x8 for gearing range. Triple fronts can be set up to shift very reliably, and you’ll have more intermediate gears with the 3x8 setup.

My wife made all of those changes you request - for her new bike that was designed from the start for hydraulic discs. But it also required a WolfLink to allow the Ultegra rear derailleur to work with the 11-40 cassette, and a modified 46-34 crankset. All so she could have the same low gearing of her previous 12-30 cassette with 24-38-48 rings. In her case, the hydraulic discs were needed because of arthritis in her hands.