Honestly I use CFW on my SYSnand only for checkpoint. My EmmuNand doesnt connect to Nintendo servers already for whatever I use it for. People say there is a risk when using CFW on your sysnand. And they are not wrong. We dont really know what Nintendo looks for or what they will look for in the future to ban people. But generally editing saves has been safe for a lot of people. As long as you are not doing illegal stuff on your sysnand and doing things like save editing you are generally safe. For now at least. I usually only boot cfw and inject the save then boot back into emmunand immediately without issue.
In the end its your call, I just thought I would let you know what I know not that I am an expert or anything.