Super73 R owner needing a kid seat solution- please help

I have a 25 pound toddler and I’d like to add a kid seat to the back and I’m wondering what rack and what seat I should get. I’d like it to hold up to 40ish pounds I suppose. I wasted $180 getting a Thule Yepp Nexxt 2 Mini that I can’t install and can’t return
Thanks in advance!