In theory any II affiliated deposit would be able to exchange into Aruba Ocean Club, if they had enough trading power, and many people do every year.
The question here is what gives you the best odds of getting that specific resort, if you can't buy what you want at the resort. The answer to that is to get a platinum resale MVC resort to use as a deposit in II. Which MVC resort and unit size you need to get, depends completely on what unit size and date you are looking to book at Ocean Club. The answer if you want a 3-bed in peak season is different from if you want a studio in low season.
In general, TUG experience is that a high season 2 or 3-bed Grand Chateau works well across the system, and can also perform well when locked off. There is no reason to believe that a Lagunamar 1-bed gold plus wouldn't see Aruba Ocean Club inventory, how much and whether it would meet your needs well enough is difficult to tell from the info provided to date and subject to the general supply variability of inventory in II.
