Did not want to rain on your parade Gary, but I think that you have made the right decision. Shadow chrome your 78s and put them on with a 12 - 15mm spacer on the rear, they will look superb 
+1 for the style 71As always Brian, you are the voice of reason! I'm probably 20 years too old to run that kind of stretch
I've ditched the idea for now, and am tempted to get my Breytons refurbished again, but perhaps in a different style to what I have now. There are so few alloys styles I actually like, to come across ones I actually want is unusual.
Of the remaining choices on my list it leaves either Style 108 or Style 71 split rims. Sets are available mint for £750-1000, or completely whipped for £350-£700 plus the cost of a refurb. Will most likely need new tyres as well. Ho hum...
Can you do that with 2 piece split rims?As they are split piece you could get some deeper barrels for the rear...