The juicer wont cause any flavor loss. You could try freezing the raspberries because that will rupture most of the cell walls, which the juicer wont do. That will give the yeast more to consume.
I'd give it at least 2 weeks, to let them get everything.
And there may be a sludge layer at the bottom you will want to avoid bottling/kegging.
One other point - Fresh Raspberries are covered with yeast,bacteria, and other microbes. It could work, but there is a risk.