Not trying to be rude, but I prefer using fleece blankets for my suggies. We know they are safe. We dont know what is in the nesting cotton and what could happen if they ingest it or get it in their eyes.
As far as peanut butter, Ive never heard of anyone feeding it to them and would have to do some research before answering.
It isnt advisable to feed bird seed to suggies. There are so many other treats that are good for them to choose from - yogurt, applesauce, babyfood fruit which can all be used as licky treats and are great bonding tools.