IMO, if the "road Buzz" is enough to damage the camera, you may need to re-think your bike set up anyway. Is it really any worse on the front of a touring bike than the floor of your car? what if the front end is out of alignment and there is a high frequency "buzz" in the car? or worse yet bouncing around in the trunk. This is the same kind of logic that keeps you at home in the garden taking pictures of flowers while holding the camera with cotton gloves.

The camera will get used more if it is easy to get to. The more you use it, the more likely you are to get shots you want to keep. The easiest place to get to a DSLR is in a front bag that you can reach from the saddle. Everybody will work through the process and finds what works best for them.

For me it is a bag suspended between the bars. The camera protected on all 7 of 8 sides like a roll cage. Wide tires properly inflated makes the "buzz" a non issue. Handling, front loading and all are becoming a non-issue as well with bikes designed appropriately.