I think Brown and Smith would compliment each other quite nicely, with Browns passing ad kicking near to the line along with Smiths long kicking game they'd do fine.
They'd just need a decent fullback to make up for their lack of pace so Matty Russell would also work out well, I can't see him being on mega bucks at Wire so you may stand a chance.
Also you'd need to get rid of Wilkin, Vea, Savelio, Richards and the other young pudding. Sign Akuma Ta'ai, Ollie Roberts, Ben Murdoch Masila and you wouldn't go far wrong.