The advantage of adding cubes is you can pull your beer off when you hit the desired amount of "oakiness". I have experienced the quick and overpowering oak from chips... however you can work around it. The chips release everything fast so I would recommend undershooting heavily especially since its a light beer like a tripel. Maybe start with a 1/2 oz or even a 1/4 ounce (really all depends on level of oak you want - personal taste varies)... I've had a single ounce go over the threshold I wanted. Tasting once a week should give you a good idea (the chips will do their work fast). You can always add more if you want, but you can't remove the oak taste.
The wine soak or liquor soak will sanitize, but you really shouldn't run into any infection problems because a tripel will have quite a bit of alcohol. However it is frequently recommended to boil your chips/cubes for 10 - 15 minutes first inorder to remove some excess tannins and that tree taste you really don't want, so in my opinion definately boil them first.
Hope that helps, I bet it will be a tasty beer !