Has anyone here landed on a 5 degree upslope here?
The proposal has you landing on the flat. It's only towards the end of the run that you hit an incline. Similarly it's only the start of the take-off run that is inclined.
Clearly you would need a whole new set of calculations for V1 etc. With regard to complications with go-arounds, I guess you would just have to make sure the incline was less than the go-around flight profile.