Hello, I have been in that same situation for a long time. You always find hair models, separately, but very few thought of at different levels of transformation.
I am going to share with you the few that I have found, which are complete Packs, some include SSJ4 and SSJ5 others only up to SSJ3. They are new designs, not based on Vanilla hair. I recommend that ever, follow all the indications and requirements.
Kefla Base, Ssj, Ssj2 & Ssj3
videogamemods.com/xenoverse/mods/all-kefla-hairs-for-female-cac-humans-saiyans-base-ssj-ssj2-ssj3/Caulifla Base, Ssj, Ssj2, Ssj3 & Ssj4
videogamemods.com/xenoverse/mods/caulifla-hairstyle-for-huf-syf-and-maf-reupload/Gogeta Female Base hair & Ssj3 hair. Since Gogeta's hair does not change, in the first 2 states of super sayan, you usually wear the base model in those 3 stages.
videogamemods.com/xenoverse/mods/gogeta-hairstyle-for-female-cacs-and-vegetto-hairstyle-for-male-cacs-ss3-variant-acc/Gogeta female Ssj4 hair. You can complement the previous mod with this one if you want its phase 4
videogamemods.com/xenoverse/mods/gogeta-ssj4-hairstyle-for-female/Vegetto Female Hair, Base, Ssj3, Ssj4 & Ssj5. Just as with Gogeta. Super sayan stages 1 and 2 use the base model.
videogamemods.com/xenoverse/mods/vegetto-hairstyle-for-female-cacs/Shallot Hair female. Base, Ssj. This I recommend more, if you use a mod that is only of the God and Ssgss levels with only the base hair and level one you have plenty.
videogamemods.com/xenoverse/mods/diego4fun-hair-pack-9/Pony tail transformable Hair. Base, Ssj, Ssj2 & Ssj3
videogamemods.com/xenoverse/mods/diego4fun-hair-pack-6-transformable-hair-pack/Custom Hair Artificial Wrath – Yin: Female CaC Hairpack. Base, Ssj, Ssj2 & Ssj3
videogamemods.com/xenoverse/mods/artificial-wrath-yin-female-cac-hairpack-4-hairstyles/And finally, the one that is my favorite and the one that I use in my character. I personally use the normal model, without physical, installed manually. (The one that contains physics, caused me infinite screen load) Of course, all hair models, Ssj3 or Ssj5 of any mod, are usually with physics. Since these mods require them.
Hanasia Hair, Base, Ssj, Ssj2, Ssj3, Ssj4, ( Extra LGSSJ, Ssj5 )
videogamemods.com/xenoverse/mods/hanasia-hair/And this is all that I have found, searching for hours, on many occasions they do not indicate that the mods are complete Packs, or are transformable hairs. So they often go unnoticed.
If you search well you will also find transformable hair models based on Vanilla hair, but I don't like those. They are usually quite ugly designs in my opinion.
Well, I hope it helps you, since I have been in the same situation, and trying to mix hair styles, separately, from multiple mods, to have something coherent, for the different levels of transformation, is very complicated. For this reason, I think that this type of Packs, like Hanasia's, are the best Hair mods that exist.
Seriously, what do I want Karoly base hair, if you don't give me ssj, ssj2 and ssj3 at least XD