HFD,
That crosswind entry would 'expose your belly' to traffic joining the pattern via an extended downwind. I'm not saying your preferred pattern is a bad one, just that if you are at a non-towered airfield in the US, you can enter the pattern anywhere you want, or even just fly an extended final. See and avoid is key, you don't even have to have a radio, and can even land on the opposite end of the runway that everybody else is using. However if you had an accident I suspect the pattern in the AIM is the non careless and reckless one. Best to fly what everybody else expects.