Multiple alt adopts?
 

I'm wondering if there is already an existing mod, or any easy way to add more alt images and coinciding chances to get the alt to an adoptable.

So for example:

Normal Adopt
Always Available

>> 1st Alt Image
>>> 1 in 20 chance to get

>> 2nd Alt Image
>>> 1 in 100 chance to get

>> 3rd Alt Image
>>> 1 in 500 chance to get

I feel like this would probably be a lot of modding for someone to do, but if there's some kinda easy way I could do this or already an existing mod I couldn't find let me know pleasee! Thanks!