Hi there!
No, there is no way to change the cover image. And it is really not a simple solution to get what you want.
But I know someone already did a plugin that work like that, and it was free. I just don't remember the name of tha person here on itch io. But it is the same creator of a nice RPG Maker debug tool. If you manage to find it, maybe you manage to find his plugin here on itch io.