Can I Create my custom texture class?

I want create new Texture Type like ProceduralTexture. I don't want use already existing texture class like Texture2D or ProceduralTexture.

Because I want using my custom data stream dynamically upload to texture content. And I want this updaload job is done in real-time, not build-time or import-time. And this new texture class instance must can be assign to material's texture reference.

But Unity Built-in Texture class did not support WritePixel() method or SetNativeTexturePtr() method.

Can I write code that impement this function? Or I need unity engine source code?