Yes it would. Nevertheless, I suspect there are many AMD64 boxes that run (primarily) 32-bit perls, because those perls provide better mileage. I hardly ever use my 64-bit perl on this Vista64 AMD64 box for precisely that reason.
Anyway, I expect the main problem you're going to face (assuming you've got a suitable compiler) is finding 64-bit builds of those requisite third party XML libraries. If you can find/build them, your problems should be over. I'll see if I can find them myself tomorrow, when I have the time - in the meantime, I'd be interested to hear of any progress you make.