Wolf, I dont think anything has been done with the Link Belt yet. I am currently working for a different company.
On to your rotating grapple. The idea is a good one, I just dont know how it would hold up to the US style wrecking. Around here it seems most operations use a grapple for a front line wrecking, just as much as they use it for sorting. It seems to me that the rotators would not handle the abuse cause by grabbing and pulling on heavy steel structures.
At MCM our labounty msd3000 shear with rotator was the main wrecking attachment. Not only was it used to cut the structure, but it was also used for pushing and pulling not only scraper beams, but large sections of concrete floor. The rotator took a lot of abuse, and had to be rebuilt during the job. I think the same would be true with a rotating grapple in the same applications. I also find that in 99% of applications, all it takes is to set a grapple tine next to the object i want to pick up, and slide it one way or the other to grab it.