Likely not what you are after, but just putting it out there if you are into the idea. Most wedding catering companies will go anywhere. So you can pretty easily have them come, setup tables, tents, kitchen etc at any location you want. It js more legwork, but if you want a really outdoor style and dont lime the astic grass, its actually not so hard to.setup.
The only real issue will most likely be entitled/loud mouths that were invited (often family) criticizing everything and making your wife cry. If you accept that early on in the planning, it becomes less of a problem come the day I suggest lightening the mood by placingbets on who will be an asshole and when. the wife will then have fun with it on the day, as she has mentally prepared for it, rather than a ball of sad.
Fun times, congrats. Xiziwan is a nice area. That hill has some gorgeous places. Take a.scooter ride and discover, lots of potential private spots there