TPF the answer to all is YES.
I suggest starting your seed in a different medium such as a rapid rooter plug, which you can then put into hydro when you see it has roots. Some growers make a little wick out of a piece of nylon cord that hangs from the reservoir to the roots of the young plant so that it gets a bit of moisture, but with drip you should not need that.
The 'waterfarm' style of hydro buckets are a hybrid drip ring and DWC. There are many people on here growing beautiful plants with that type of system.