If that's your plan just go visa exempt. You'll get 60 days then extend for 30, fly to Japan and return and get another 60. This is still within the new rules no sweat. You're wasting way to much money doing it the non o way
I've been to Galapagos twice and it should be on everyones bucket list. The diving there is the best in the world only rivaled by Socorro in Mexico. I've dived Cocos in Costa Rica as well which is also incredible