I had a similar thought of keeping it stock, or at least no change that couldn't be bolted back on. I don't put that many miles on per year, so it will stay low mileage for a while.
I have an old Lucas tail light sitting around and changing over to that was one of my ideas also. Too much visual spam back there. I'll try and fabricate a bracket and plate holder, unless someone sells something like that. I saw one on a German site, anyone know of a vendor in the US? Also would like much smaller aftermarket turn signals front and rear.
As far as the bars, it looks like in addition to adapters for the clamps, they would also be needed for the controls or brake master? What type of alum. tubing was used?