Based on my experience of porting Meego to the Galaxy Tab, it ought to be possible, but you're going to have to do quite a bit of work.

It's a snapdragon, which is a shame, as I've no idea how one could get OpenGLES working on that without any existing Linux binaries (there is a Meego page about snapdragon porting though).

In any case you'll need to download the kernel source for the device from HTC, modify it so that it will boot the Meego image you create from one of the internal partitions (or external card), write hw adaptation code for those parts that need it. Then deal with the things that Android doesn't expose through the kernel, such as the modem and gps in all likelihood.

It's not trivial, expect to spend a few months once you know what you're doing.