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your wall drain is fine, my friend... of course, because it is lower than the overflow on the sump.
As for the overflow bulkhead size... only you can determine that. I have no idea what size pump you are using to do the auto-fill... how long the timer will be set for running it... how much water will run through, etc.
That said, bigger is better (2" bulkhead perhaps).
And moreover... chances are the percent of the water changed and speed at which you will be pumping remote new seawater will be slow enough that the single bulkhead of any reasonable size will be enough. But you must above all do your own math here to be sure.
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"If you give a man a fish, he eats for a day... but if you teach a man to fish, he eats for a lifetime."
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