No the seat base is pretty thick plastic. Hey it is strong enough to hold the whole seat ON the bike with one little bracket

I was thinking maybe I could sandwich the backrest bracket between the rear bolt bracket and the seat, something like that. See 95% of the riding I do is solo, without a rear seat at all. I need it clean

Also, Kim is used to no backrest, and she clutches on bretty tight, so its not like she will be leaning back and falling asleep anytime soon anyway. It's much more for her to feel secure, and a bump stop sorta thing.