My question to all the experts....
What else would you take for bow repair in the field? Keep in mind serious weight restrictions of 50 lbs on the charter from Dar es Saalam to camp.
You are on the right track with your plan. I would suggest to make sure that you shoot the new string in as well if you are going to replace it just before the hunt. Every bow set up will vary, and each string will vary depending on the quality, but I would shoot at least 50 arrows on both strings with an identical set up to ensure that the stretch is gone and all is settled in and your tune will hold...
Beyond that, I would suggest that you pack an Allen wrench tool and/or a multi-tool that fits all of your limb bolts, sight & rest bolts, etc...A spare bolt/screw for each of the aforementioned accessories, and a spare launcher or biscuit, depending on your sight. Possibly a couple of spare pins for your sight, and a spare peep if you use one? I pack a small accessory box with all this stuff and it takes up very little space and only weighs a couple of pounds.
Good Luck!