Why not do a shakedown ride to see how your idea works.
Load up the bike with all the luggage, food and water you expect to carry on the longest sections. Add some ballast if you dont yet have the kit. Ride a few small loops to make sure the luggage stays in place then try some hills and rough roads.
People have toured on stripped down bikes with
minimal luggage in the most hostile conditions but you need to know what you are doing.