Congratulations on the new CVO RG. I have had several CVO RG, then one CVO SG and then back to the CVO RG.
I have run Yaffe 14" on three road glides, one street glide and one road king. They all felt to be same height and width. So if you like the 16" Yaffe on your street glide they should be the same in 16" on the new road glide.
When swapping bars, I would add the Kahuana grips heated grips. However I do thing the 20 got heated grips as part of the bike the XM was removed for 20.
My first change would be windshield. Lots of options. Choices really depend on personal preference and weather or not you have a back seat passenger. I run a Klock Works 14" sport flair. I like the looks and it is mostly functional for my hight, my wife has the same size on her bike and she get no wind, but she is 5'8" I get some wind and I am 6'1".
T-Bars are the latest trend. Not sure I would do them as blocks gages or you have to relocate. I'm just very comfortable with Yaffe bars.