Hi Adriano,
Your Freelander imay not be the ideal vehicle perhaps but it will be better equipped for your journey than most of the other vehicles on the roads you'll be travelling. The only times in which you'll potentially be restricted (as opposed to if you're travelling in a Defender, Cruiser etc) will be in game parks, but even then your Freelander will cope in the majority of situations.
You will be fine with a range of 700km. The only time we needed more than this was during extended periods in game parks and going through Turkana. The roads you are planning to take are well travelled with regular fuel. The toughest road on your route is as you say Isolo to Moyale. We never did this road, choosing Turkana instead, but it is notorious. Just take it slow. It would be wise to avoid getting here in the rainy season which is broadly June to September.
I would seriously consider leaving the car in Nairobi rather than Addis and getting a cheap flight into Addis. There are several reasons.
1) As you probably know you can't get your Ethiopian visa on the road. You have to courier your passport back to your home country. So you'll potentially have a couple of weeks delay in Nairobi doing this. But if you fly into Addis you get a 90 day visa on arrival (check that's the case for Brazilians too but I suspect so). The flight will probably little more than the fuel.
2) There are various overlander friendly places that store vehicles safely in Nairobi eg Jungle Junction. Less so in Addis (though there is Wims).
3) You will avoid the Isolo to Moyale road (which may take a toll on the car).
4) it's pretty easy to travel around Ethiopia on public transport.
No reason not to use a carnet, it's easier. Just remember if your're leaving the car somewhere you need to get it back before the carnet expires (1 year). it may be possible to renew without the car being returned but sometimes that involves getting the old carnet stamped out and entering another country on a TIP which I suspect you can't easily do from Ethiopia. May be another reason to leave the car in Kenya as you can enter Tanzania on a TIP and possibly also Uganda. Check out your options with the AA.
Get Comesa yellow card insurance once you are in Zambia. You have to get the local insurance first and this is a kind of extension to it. There are a few posts with details of where to get it on this forum. It may not save you a lot of money but it is a big convenience. At most borders local insurance is the only thing you need local currency for (other things like visas and taxes are often payable in $). So having Comesa often means you don't have to change money at the border but can get to the next cash point or bank.
Itchyfeet
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