Clarion,
The permits I have a dispatcher that gets it for us. It is a contract with my company.
Guys, route georgetown, cayena, Macapá and Belem (whatever you decide) you have to Plan for detours. A lot of CBs N Brazil. I will start from soca.
As you desire short legs, I thought of a new route. Let's if you like it:
soca-sbbe (Belem)- 439NM (I will use direct distance, pls Plan for awys);
Sbbe-sbpj (Palmas) - 534NM;
Sbpj-sbgo (Goiânia) - 384NM (transit here is faster than Brasilia-sbbr)
Sbgo-sbrp (Ribeirão Preto) - 282NM (Nice fuel stop)
Sbrp-sbfl (Florianopolis) - 394NM
Sbfl-sumu (Montevideo-Carrasco) - 575NM
Option: sbfl-sbpa(Porto Alegre)-sumu - 196+380NM
Sumu-saez (Ezeiza) - 124NM
This is just an example of you can do. If you go via seashore the Planning will be quite different. Any Place in this list is a good overnight stop.
Buenas,
Sydy