GRX is a nice option for maybe an ultralight setup, but I'd still want lower gearing. My new bike will be using Shimano XT 2x11 with 38/28T chainrings and an 11-42T cassette combined with XT hydro brakes. Perfect gearing range IMO, inexpensive, and reliable.
I've never understood the appeal of cross top brake levers on any bike. You reduce your leverage over the front end at the same time as more of your weight is shifting forward. If you want better control of your bike when braking, use the drops!