1) This is the Pair Valve system
It is totally safe for the bike to remove it. You will only have issues when a MOT inspection is performed on the bike, due to very rich exhaust fumes in CO.
Other than that, the bike is perfectly fine without it.
All you need to do is to close the airbox's inlet nozzles where the two X are plugged on and the two nozzles on the cylinder head's cover where the two O are plugged also on.
2) This is the flapper valve control system
Removing only the items illustrated in the picture leaves the flapper inside the bikes air duct nozzle closed. That means less incoming air in high speeds (rich mixture) but better throttle response in mid and low rpm range.
You can move up a step an remove the flapper from inside the bike's air duct as well but then you'll need to increase your injected fuel quantity throughout the rpm range to meet the proper mixture analogy. That means you need to take the bike to have a custom PCIII map made.
Removing the illustrated components is very easy. Just block the nozzle on the throttle bodies where the X is attached and you're done.
Hope that helps