adjusting sweetens in a keg??

What is the best way to adjust sweetens in a keg?  Mainly I am concerned with adding the honey without introducing oxygen.  I thought about racking into a carboy, then back to the keg? I was wondering how others add there honey/water mixture, and if oxygen is a concern when you pouring into a keg blanketed with co2. ???
Thanks

Adding it isn’t the problem. Not enough oxygen will be introduced by just pouring in some honey through a blanket of co2.

The honey will add more fermentable sugars to the mix and it will ferment at serving temps albeit slowly. Not a problem if one plans to drink it up rapidly.  Otherwise the brew will be overcarbed.  And not sweeter.