I'm fairly familiar with the module, and I have to say that while you could run it for a level 10 party, you would have to significantly overhaul the module. The monster stats, as well as the assumptions about what the party can do, are just not in line with 10th level parties.
This isn't to say that it couldn't be done, just that it would take a lot of work to pull off, and it likely wouldn't be recognizable as RHoD. You may wish to speak with KSBSnowowl about this, since I know he used a fairly heavily modified version himself.