Need help making a shapeshifting skill Options

[Viscus]

As the title says I have a character that I want to change "forms" , and based on the form I want a few select stats to increase in a percent.
So based on level the form is fairly on par through the whole game. Is there a simple way to do this that I am just over looking? I would like to do this without getting into scripts as I don't know a thing about them. Thanks for your time.