Can you get the PADI Nitrox book and do most of the work and then just quickly pass the test now days? My LDC (which isnt that local) sold me the book and I drove down and tested with an instructor in like 20 minutes.
If the nitrox course is still just book learning and a test, I agree. Do it at home if possible and reduce the amount of reading you have to do there.
When I stayed at the Galapago Inn (now SCC) there was a person diving with them who was staying at another nearby hotel. Ask if they still allow that. My view is that if you stay at SCC, no other dive ops pick up there. Of course you could stay there and walk into town to be picked up or take a taxi to the caleta.