If you were more local I have a box of those single leading 8" full width hubs spare
but probably not cost effective to ship some.
I went a bit overboard and retrofitted a spare correct brake plate to disguise my use of a later hub. you could do this with a 7" TLS brake off a B44SS or triumph daytona, which would give you something not looking out of place to the average joe.
But it gave me the best possible brake setup that looked period. Yes the flange is a giveaway for those true purists but it allows the wider shoes.
Keep us posted, it'll be a real sweetie I'm sure
this bike had had the borani alloy rims fitted in the early seventies so I kept them as part of its history