An ASG isn’t nearly as difficult as setting up, securing, and running dokku. There’s even examples and such for setting up the ASG. If you get stuck, all accounts have free support and stack overflow is a few clicks away. The idea that one needs to switch to dokku to avoid setting up ASGs is just silly.

My suggestion was the opposite: don't use Dokku, because you probably don't need it if you're capable of dinking around with AWS.