If you add an Android-specific class like TextView in your code, you can easily have Android Studio add the needed import command for it.
With Emacs/JDE, I point my jde-global-classpath to the Android jar, then when I need to add an import line I highlight the class and do a Control-C, Control-V, Control-Z. It is slightly more convoluted than Studio but works well enough, I could probably automate and simplify it more if I needed to. This was the main shortcut I missed when moving from Eclipse/ADT to Android, but doing this got it back for me.
You might want to make you have parallel builds and the gradle daemon on for the gradle CLI. Android Studio seems to turn these on for you but if you build from the terminal I think they need to be specified in a gradle.properties file in the project root. You can also increase the amount of memory gradle is allowed to use.
As far as I know Kotlin does almost all of its magic at compile time so I am sure it will slow down builds slightly versus plain Java. From what I have seen so far I am more than willing to pay this price.
Here is a good overview with benchmarks from Square
https://docs.google.com/document/d/1ReS3ep-hjxWA8kZi0YqDbEhC...
(I'm unemployed and don't really want to pay for a 64-bit system. Anybody want to hire me so I can afford a new computer?)
So at least we can make use of some C++ love, even if the frameworks access is limited.
Retrolambda is rather useful to get a subset of J8 features.
I never advise hacks for production code. Either it is first class support or it doesn't get used.
Adding extra layers to debug only increases production costs.