I like your way of thinking here, but unfortunately I do not agree, because the contexts of the two different crashes are completely different and the points that Fitzgerald tries to bring out are also completely different. Let me explain. Chapter Three, where the crash with Owl Eyes occurs, is a massive description of the kind of parties that Gatsby threw, who went there and what the guests got up to during the party. We already met Owl Eyes saying he had been "drunk for a week" in Gatsby's library, and the drunkenness of Owl Eyes and the other person who was in the car when it crashed, and didn't even know that it had stopped, clearly highlights the kind of irresponsible attitude of the rich and famous who attended Gatsby's parties.
Clearly this incident bears little similarity with the crash that clears Myrtle. In the crash in Chapter Three, no one is killed and the car is completely de-railed because of drunkenness. In the crash towards the end of the book where Myrtle dies, it is a cold-blooded act of murder that is not a result of drunkenness and does not destroy the car, apart from denting it. The only similarities that do exist between the two crashes are that they both occur because the upper class are able to do these kind of things and get away with it, without facing any punishment that will severely effect them. Of course, Daisy is able to get Gatsby to take the blame for killing Myrtle.