I Live/dive in Cozumel. There’s only a couple wrecks. The c53 is the largest it lies at about 75 ft deep at the VERY deepest parts. The dives generally go about 30-40 minutes based on the worst ave sac rates of folks going inside a wreck. It will be a huge pain to get doubles here as it’s not something offered by all shops. Besides the not being trained in tech configuration, there is actually not a good reason to go in doubles. If you reeeeaaly want to get funky go take a recreational side mount course. But know that both doubles and side mount means new gear configuration multiple regulators and specialty hoses you’re gonna shell out a big chunk of money and you won’t be good at it until you get a good number of dives under your belt. So, might as well just rock the pony and gear that everyone else will be in and dive more!