Hello FS Creations,
I like Monsters 
. I have yet to acquire a Character Customizer from the marketplace due to the limitations you’ve mentioned, but, the MAJOR issue is the the lack of Supplemental Modular Clothing Packs for the Characters. Thus, I’ve been forced to develop my own.
I can rationalize why a Creators of Character Customizers would leave Clothing upto the Developers using it, but… Any Developer who has the means to create Clothing, would have the means create their own Character Customizer, so therein is a dilemma. Additionally, $upplemental Outfit Packs could provide additional revenue.
I would not acquire a Character Customizer without Supplemental Modular Clothing Packs. However, I may consider a Humanoid Monster Customizer as Monsters don’t necessarily need Clothing, because their Skin is the Clothing.
Without providing Supplemental Modular Clothing Packs, I don’t see a Universal Character Creation System, but, I can easily see a Humanoid Monster Creation System. I personally think everyone would benefit greater with focus on Clothing for other’s Characters. Perhaps a Universal Clothing Customization System.
In either case, your work looks fantastic. Keep it up.