I don’t mean anything official but a 3rd party fork maybe. I’ve tried kotlinc CLI tool and it’s not very interactive and doesn’t promote exploratory programming because it’s not like a live jvm process that it compiles against and runs in like jshell. Try out jshell if you haven’t, it’s a bit akward but super powerful once you get the hang of it.
It’s nice if you want to test something in your existing code really quickly with a one liner or whatever. Jshell exposes an interface on the SPI for hotswapping types and whatnot so I don’t thing it’d be that difficult to implement. Was just curious for myself I guess, not requesting someone else to do it 
Kotlinc makes understanding javac look like a walk in the park though, especially since source & building the language tools isn’t documented