is it possible to use compose multiplatform with the k2 compiler?

There is experimental support: https://developer.android.com/jetpack/androidx/releases/compose-compiler#1.5.0

There were a bunch of issues fixed for k2 in kotlin 1.9.20-Beta. The corresponding compose compiler plugin is 1.5.2.1-Beta2. Or you can simply use Compose Multiplatform 1.5.10-beta01 and kotlin 1.9.20-Beta.