I'm going through a similar exercise at the moment and the short answer is, no.

For argument's sake let's say the UK version is 25mm bore and the magnum US version is 30mm bore. The UK version would basically end up like a sleeved down HW80 and the first thing everyone will say is - just get an hw99

When you start putting an idea down on paper (or in CAD) you very quickly realise the compromises that manufacturers have to make to please the majority.