Without steppping on anyone's toes I found that Hi-Spec can produce custom alloy hubs for 70GBP each. I sent them the specs of what I'm after to see if they had an off the shelf item but they don't and that was their reply. I'm not too sure how far you can deviate from their standard line but I think it opens up some oportunities at a bargain price.
I was quoted $400 ea locally to machine up a set of alloy hubs

Well, after thinking I could reinvent the wheel it turns out it's not possible - It's sorta beaten me
I will be doing as HAK has done and istalling a sleave over the outer stub axle and run the larger Capri outer bearing. I will use 15580 / 15520 combo for the inner plus sort out my seal options. The one thing I will do differently is to measure the stack height of the bearings to assess what I need to do to position the Capri hub as per the standard item. I'm sure it's as simple as inserting a machined packer behind the inner bearing cup prior to installation. That way I won't run into problems with clearance between the rotor and steering arms etc.

Excellent,
 
Good to know I haven't wasted my money!  LOL
 
Matt

I conjunction with 2 piece alloy hats might make another small decrease in weight when compared to the same sized integrated cast item.