If they were truly ONLY coastal and bay sailing, WHY does this boat have a european A rating? ie ocean rating to with stand seas to 10 meters, winds to force 10, which IIRC is at least 50+ knots? Granted it may not be the strongest boat in the open ocean rating class. BUT< it is still rated to do so. Just like the SO37 you are sailing currently, which by the way, MANY of them have done open ocean sailing, the 409 will probably do just fine.
You will also probably find the 409 will go faster by a reasonable clip over an HR, Sabre or caliber too. So less potential time in the open to deal with storm conditions.
Then again, I have yet to get on a 409, I think there has only been one delivered here in Seattle, not sure if it is sold or still at the dealer, so it may not be as nice as the older versions like the SO37 etc. Gut tells me, taking a 409 off shore should not be an issue! Unless you want to go around cape horn
...........now on a bad day you might have an issue with the 409!