I would go with the temporary schedule. The Dec 9th date is just a guess...one never knows for sure if the second ferry will be back on the 9th. If you are taking the direct bus, you will not be stopping at every bus stop! That is the beauty of this bus schedule! Your luggage gets stored underneath and you don't have to worry about it until you reach Santa Teresa.
If you are taking the normal bus, you will be stopping at most bus stops and you will have to take a taxi from the Puntarenas bus station to the ferry terminal, then get onto a bus on the Paquera side.
If the 6 AM direct bus is too early for you, then take the 2 PM bus. Remember, the bus station has changed from the Coca Cola Station to the San Carlos station (also named the Atlantic Station). The bus times have not changed. Be there ahead of time so you can get onto the bus, first come, first on and in a seat. There are no advanced ticket purchases.
If you want to leave later in the morning, but not as late as 2 PM, maybe think about taking a shuttle bus for about $40. But, then again, your ride also works around the temporary ferry schedule....which is in effect until the second ferry really and truly arrives back on the route!!! We can never be sure what day that is until it really happens! There are no guarantees! Right now, the last ferry leaving Puntarenas is at 5PM.