Has anyone successfully set up an SD card to have an Android install on it?

What I want to do: use my 32GB SD card to have vanilla Android on it so that I can dual boot my Nook HD between the Nook’s proprietary launcher and vanilla Android*. I do not actually want to root the Nook–I just want vanilla Android available to me so I can switch back and forth and see which I like better.

(The main reason I don’t want to root the Nook right now is that it’s still under warranty, and rooting it will violate that warranty.)

I’ve done a bunch of googling, but the various interesting links I’m finding, while interesting, seem like they’re geared towards actually rooting the device. I’m also seeing a bunch of references to just buying images of Android you can plunk onto an SD card. But while that does sound convenient, screw that, I’ve got the tech chops to do an install myself. I just need to know the proper steps.

Anybody done this? If you have, can you point me at any notable links of interest on how to do it?

* For values of ‘vanilla Android’ meaning ‘I’m open to icecreamsandwich or kitkat or whatever works’. The Nook HD ships with what appears to be a B&N-hacked version of cyanogenmod’s hummingbird build, so I’m fine with looking at that, too.