kotlin-common | Reactive Programming library

I'm trying to start using Kotlin DSL with gradle in the project with the following restrictions:

• Project has different modules (moreover: sometimes these modules use different plugins, however if two projects uses the same plugin then version of the plugins are the same).
• Project has internal corporate repositories only (e.g. we don't use jcenter directly, we use proxy for it).

What we have with Groovy:

• Some common configurations items are excluded to the separate scripts. Please check the example below.
• Gradle modules include these files.

As a result (just based on my example):

• We don't need to add the same code lines into the each module.
• The most of projects have difference just with dependency list.

I tried to reproduce the same with Gralde KTS and received the following difficulties:

• I'm unable to apply plugin in the include file and use it in the module. In this case I receive compilation error (because plugin types are not added into the module script).
• I'm unable to extract constants to the something common to use them in the each scripts (root build.gradle.kts inclusive). With Groovy I can just use variable like springBootVersion, however with Kotlin Script I have to create the same property in the each module file.
• Precompiled script plugins does not work without public repositories access (e.g. I'm unable to configure common script file with idea "just use default embedded Kotlin Script version, download all dependencies from these urls: ...".

Include file sample:

I am looking at using kotlin to target IOS and Android development. I know kotlin-native is very new and the details are still being ironed out.

My question is, how do I target kotlin-common? How do I write kotlin code that runs on both idiosyncratic platforms without issues?

For example, worker threads are being used with kotlin-native while kotlin-JVM uses coroutines. How do I write threaded applications that target both platforms?

EDIT------------ Downvoting without giving a reason is downright lazy and shameful. Give me the reason so I know not to make the same mistake again.

This is a legitiment question.