Multiple alt adopts?

[tahbikat]

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!