John - for most of the greens expansions we used grass from our tees that were being rebuilt. It was convenient because the work was being done at the same time, so we only had to move the sod once. We started lowering the heights on those tees several months before we flipped the sod to the expansions and were pretty successful. Those areas blended really well.
The collars we really just mowed down. This is our 4th season now since we had collars and the only time you can tell where they used to be is in the early spring when the poa is still looking a bit pukey.
Later on in the project we used some nursery sod that we had grown because we were running short on the tee sod. Unfortunately, it had a much higher concentration of bentgrass and those areas don't match as well. I am considering switching them out eventually.
I 100% agree with what Randy said and in fact I'd argue that the shot is more complicated when there is a collar because you have to judge the speed over 2 cuts of grass rather than just the one. Also, IMO the shot against edge of the rough isn't any more common when you don't have a collar (fringe) cut, but as we all know... sometimes people want to blame someone else for their bad shot, and not having a collar in that situation is a convenient culprit.
In the end, change is difficult, and sometimes members just want things to stay the same. At Paramount we really tried to embrace history and the idea that less is more when it comes to lines, distractions and "fluff". My recommendation is to trust what Jim wants to do, and look for creative ways to make it work.
We found that lowering the height of our rough to 1.5" around the greens was the best solution, and after about a year even the members who were initially against it ended up in favor of the change.