If theres going to be a Spot it makes much more sense for her to come with TNG Data seeming in Picard she was just a memory. After Picard himself Data is my number 1 priority from the TNG series proper.
As for the Seven discussion, I would prefer her to be wearing the regular uniform from the end of the show as she's a Captain and the gold comm badge would stand out from say a Shaw figure who I would also prefer in the regular uniform.
Thats in part because I love those new uniforms, they are just behind the First Contact and Wrath of Khan and just in front of the Voyager uniforms for me.
The other reason is if any of the Enterprise crew come in the leather jackets it will make them stand apart a little - not to mention that in honesty the concept of those jackets in 1:6 scares me and would we actually need beat up sculpts for both Seven and Shaw in those uniforms?
Also, bringing it back to Seven, lets say a new show goes into production and they decide not to tweak the uniform further - this will likely be after Nanjin's Five Year Mission is complete so there is no guarantees what Exo-6 will do at that point so it might be the only chance at getting Seven as a Captain!