As for getting the oak chips out, I think I'm with brewchez in that once you rack out the beer you may have to rinse it a few times but you should able to get it out with the beer no longer in the way.
However, I found this question because I was trying to figure out to get the oak chips in the carboy in a sanitary manner. So for what it's worth, I figured I'd add the process I used here:
- Soaked oak chips in a sanitized bowl filled with tap water for 1 hour (covered with a sheet of sanitized aluminum foil).
- Sanitized a spoon and had a spray bottle of Stan San on hand.
- Sprayed down the neck of the carboy with sanitizer.
- Added oak chips a spoonful at a time.
- This was a little time-consuming and mildly messy, with a number of chips lost in the process due to mostly to carelessness and a spoon that was probably too large.
- Also, I considered using a funnel for this but the biggest one I have is just small enough at the end that I was slightly worried about damaging it trying to get some of the larger chips through (Hopwise's suggestion of cutting the chips down might have worked here but that would result in more handling of the oak chips than I wanted to risk).
- Sprayed sanitizer along the inside of the neck of the carboy to get any chips that stuck to it to fall in.
- Sprayed down airlock and re-attached to carboy.
Based on the research I've done I think this should be sufficient to minimize the risk of infection (though this is the first time I'm doing it so I'm open to suggestions as to how it might be improved!).
Regardless, once I've tried the beer I'll report back to at least provide some anecdotal evidence as to how well this worked.