Make as is then include 1 cup shredded coconut, adding it when adding the oats.

Sesame seed butter would be a good alternative for peanut butter and unfortunately the rice krispies wouldn’t work here in place of oats.

You need to bring just sugar, butter, and milk to boil, then allow to boil for one minute. I’ve made these many many times and that has always been reliable without a thermometer. Comes out solid, not crumbly or tacky.
Sometimes I add more oats, but I also like to add finely chopped walnuts and raisins and less sugar

You didn’t boil it long enough, I’ve made them several times and no problem. The sugar has to reach 230, hence the reason for boiling for 1 minute after boiling point.

Know what’s even better than your formatting the criticism? Send it in and email rather than the comment section!
Grammar doesn’t affect the recipe at all!

Just traditional creamy skippy or jif works well.