OK, I ended up takeing the easiest 'root' (see what I did there
) and rooted using Unrevoked, using the packaged ClockWorkMod recovery, and behold, I now have MildWild 4.9.1 up and working. I have to say, it's brilliant, there's so much additional functionality it's ridiculous. MS Exchange is syncing nicely too!
I do have a couple of questions...
Settings > Display seems to crash, so can't change anything in there - anyone else get this?
Is it possible to get more HTC-esque widgets? I miss the full-screen calendar one, and stuff like that. Are there further add-ons?
Enjoying my first foray into custom ROMS!

I do have a couple of questions...
Settings > Display seems to crash, so can't change anything in there - anyone else get this?
Is it possible to get more HTC-esque widgets? I miss the full-screen calendar one, and stuff like that. Are there further add-ons?
Enjoying my first foray into custom ROMS!