The Keyboard Layout Creator seems to work perfectly for sorting out the symbols. I just created a 'United Kingdom (MBP)' layout and installed it in the VM. You can switch to it from Control Panel>Regional and Language Options (and switch back if it doesn't work for you!)
It hasn't interfered with the ctrl/alt/option/command/win keys at all - in fact I don't think you can modify them using this utility. The 'remapkey' utility is probably more appropriate for this purpose.
Good luck all,
Tom