Right now, its better to forget about myriad's Alien Dalvik and focus on dualbooting ICS on the N9.

But there might not be a need for it afterall, I just discovered something recently.

Android is maturing fast and slowly offering the things linux users want. They are also changing the aosp kernel each interval and adding things from the mainline (linux) kernel.
Linux is maturing too (its pretty mature already) and they're beginning to incorporate things found in Android.
...now I'm not saying wait for android as it will support linux, that's like waiting on a cliff for another continent to collide with yours so you can cross it.

Nevertheless the gap is slowly decreasing.
There's a project called the AML (Android Mainling Project) and they are actively progressing with their checkpoints. This project aims to create a "hybrid android kernel" with linux kernel implementations. Basically meaning a linux kernel with android features, so both platforms are crudely supported.

There's another project which has been on-hold for sometime. There is a lot of interest in it, but nothing quite getting done due to some issues. It's called Necesitas, and its a project that's trying to port the Qt framework to Android. Now we've seen how Qt (simplified C++ language) behaves with Linux (Maemo 5, 6, MeeGo, KDE, PlasmaActive etc)...it behaves wonderfully.

Now I want you to imagine this.
AML + Necesitas = what you end up with is compatibility with native linux code (will need some light re-writing) and compatibility with Qt-based Apps (basically anything C++ with quick revision, or anything made for Symbian/Mae5/6/MeeGo etc etc).

In short,
AML + Necesitas= AWESOME =MeeGo + Dalvik

For analogy sake;
Dualbooting ICS / Having two separate phones is like having a teleporter between both continents.
You can easily do linux or android, but you cannot do both of them (rebooting your phone).

VNC-linux (on Android device) is like having a slow sailboat to cross the sea.
AML (alone) is like crossing a long wooden bridge on a motorbike.
AML and Necesitas is like crossing a long concrete bridge with a racing car.
MeeGo and Dalvik is like flying over the sea on a small plane.