why take the 50mil? 17-40 goes almost to 50. if you take the 70-200 you dont need the 100mm lens either unless youre really passionate about macro work and expect many macro subjects. youll save weight which is very important, imo. maybe on the weight saved by not taking the 50mil and 100 you can take a lightweight monopod for better quality than just hand-held shooting.
since you are taking only 28mm lens youre probably not ging to do very demanding stuff like sports from your camera except its sensor. maybe you can buy the first mark 5D for the trip and sell it after the trip and count the money difference as insurance. with a cheaper camera you wont risk so much money and wil lbe able to enjoy the trip more relaxed. also maybe a small mirrorless or premium compact would do as well?