Is it not possible to directly use the gobind instead of gomobile bind and replace/modify the generated names to your liking?
BTW we chose to include the package names in name generation because in Go, package names are important part of exported names (e.g. Go code uses fmt.Fprintf, not Fprintf), and even choosing the right package name is often discussed in various Go best-practice docs. e.g. https://blog.golang.org/package-names