I think all your requirements (except for price) would be met with a flagship micro-4/3 camera. I'm traditionally a FF guy, but have been carrying a micro-4/3 camera as a backup for several years. There are occasions that I've used micro-4/3 as my only travel camera and the results are very satisfactory.
I own an Olympus OMD EM-1 Mk2 and typically use the Olympus 12-100 f/4. It is a small, light, and fantastic combination, but the price is high. I've shot tack-sharp 4 second handheld exposures with that combination. For most photography, one can eliminate a tripod. It is a very weather resistant combination. I don't own a Panasonic G9, but do own several Panasonic micro-4/3 cameras and can attest to their quality and simpler menu vs Olympus. The G9 with Panasonic's 12-60 would give the user the same dual IS functionality as the Olympus mentioned above, for long exposures, handheld. It also has good weather resistance, etc.
Some may balk at spending so much on a camera with a small sensor, but the quality is really there. With sensor shift, on a tripod, the image quality surpasses the best FF cameras, except for perhaps the Pentax K1 series. Also, with micro-4/3, the lenses are smaller than the equivalent lens on a FF mirrorless camera. Highly recommended.