I think it would be great to split the face accessory (masks, glasses, eye patches, etc) from the head accessory (hats) so that you can just use your head as the base and switch it up to your look without more head uploads. I used to work on a project that had split everything up so you could have back accessories, face accessories, neck accessories, etc. However, this is something that really needs done at the very start. I believe that trying to add it in at this stage would require editing some 800ish files that are uploaded and that is a lot of work for something like this.