Hola Fernando,
Thank you for your message. I don't know if you can find what you need in Brazil, perhaps if you cruise up to Panama, you can find the electronics you need at a price that will not be robbery. What you can do with regards to having 2 stations, is put the electronics inside the cabin and have slave monitors on the fly bridge. That is something I am looking to do on my troller. I have a pit on the stern where I catch my fish and I cannot monitor the engine or the navigation from there, so I am planning on putting a water proof monitor in the back where I am working so I can keep a better eye on things. I am currently working on a vessel chartered to Exxon/Mobil over in Nigeria, I perform rig tending and tanker towing. All the best.
Brad