At this and last year's Stafford show, a firm was displaying a neat solution to fitting spoked wheels to a Honda Comstar-wheel bike. They were exhibiting a conversion for CX500s, but they can supply spoke flanges for the XBR too.
The kit involves unbolting the comstar 'spokes' from the wheel hub and then bolting on rings that act as spoke flanges. You can then get the wheel spoked to a rim.
The website for the company is
www.caferacerkits.co.uk (look under the heading 'CX500 extras'
[deleted to save space]