So as I've said over on Discord, there is a potential solution to all the clipping/placement issues regarding VFXs in the form of a Dialogue or Settings window that would open when using the items related to said VFX. It's been done on some other servers and if the Dev Team can figure it out, it would solve a lot of things.
Firstly, I would be able to only model once, instead of having to resize the VFX model for each race, gender and pheno (which quickly adds up to hours of work for just ONE item variation). This means it would save a bit of resources as there would be 1 mdl file instead of 24 (2 genders x 2 pheno x 6 races) per item variation.
Secondly, this would pretty much mean anyone could edit the VFX size and position as they please for their PC, without requiring DM help or for me to figure out where is the best compromise. It would be as good a fit as when I'm resizing the model to be more in line with the usual head shape of each race, but it sure would be a lot better than having only a third of the available heads able to properly wear the VFX.
For now, I'm putting every suggestion on my list and working my way through the models to see what looks good and what doesn't. So far, hats have it rougher because of the huge amount of clipping issues (especially with the ladies) which might mean that some of them won't make it through.