As i see this whole sonata as having to do with love and with Beethoven's "Immortal beloved" I would say it's a good choice, but of course, always when you play "slow" some non musicians claim that it's sad. Ask the bride.
Please note - I said "solemn" not sad (there's a difference). Also, although I have nothing against departure from tradition, this is when there is customarily a fanfare and announcement that brings people to their feet as the bride appears. Sort of comes down to what kind of mood you want to create among the guests.
I don't know why I always want to be original.... it can be a fault sometimes.