Opencart : Virtual stock

Hello, I have a product that can be customized by the user after he pays , so ofcourse we have only 1 stock of this "blank" products ready to be customizated. My way to manage stock now is create 1 product with many options and sizes to have the same stock , but I want to expose the picture of all availible options like different products. So what I need , I will make an example with T-shirts. This T-shirts are engraved with superheroes after client pays, so I have 300 red t-shirts (100 in each size) PRODUCT : Red T-Shirt Option Size : Size M (qty 100) Size L (qty 100) Size XL (qty 100) Option Engrave Superman Batman Aquaman NEED TO SHOW 3 products Red T-Shirt SUPERMAN : With picture of engraved superman Tshirt. (Links to Red-T shirt with superman option selected and image of this engraved) Red T-Shirt BATMAN With picture of engraved batman Tshirt. (Links to Red-T shirt with batman option selected and image of this engraved) Red T-Shirt AQUAMAN With picture of engraved aquaman Tshirt. (Links to Red-T shirt with aquaman option selected and image of this engraved) User can not see engraving option , only select size. If you have a better way to solve this problem just tell me. ONLY SERIOUS QUOTATIONS , I think I was clear enough. thanks