Continue to upgrade to the latest macOS on your host system, use something that leverages Apple's Virtualized.framework to run any version of macOS you want.
I tend to copy Markdown content from other sources into Apple Notes. Being able to paste into Notes and have it format in the view is a big win.
It is possible reporting is getting this wrong and the Markdown feature and it is just to serve use case above. As an example, Google Docs recently enabled "Paste from Markdown" that also is a huge convenience.
JetBrains already announced it is no longer targeting Fleet as its iOS strategy for Kotlin Multiplatform. Instead it will be realizing its strategy through IntelliJ IDEA and Android Studio.
For instance, consider https://tart.run/
All the Android / iOS devs on my team use Tart locally when we need to test mixed environments.
Then we use Tart's sister Cirrus CLI to run our builds on our server.