Yeah, that makes sense, actually.
If we assume the white working class are mostly B's and C's, then it's down to communicating with them in the heartland. I think educating voters on what can be done about jobs is a start - go into rural and ex-factory towns and level with them about what training can be given, what jobs they can look forward to, and what their communities get out of it. The main problem is that they need to respect the people who are talking to them, and realise they're not being sold out, they're just being sold a different future than they want (and what the Republicans sold them).
If the WWC is becoming a whole new identity group (equivalent to, say, Catholics), then they can still be Democrat voters, especially if the Republicans fall short on their promises. Jobs and economy isn't something one party owns (not like, say, abortion), and it's motivated by emotion as much as fact - "What can the Dems do for me and my kids?" is as emotional a question as it is factual. It's just the Republicans don't care about lying, and can use that to their advantage. Get them to realise that they and their kids are being sold short by the Republicans. and you can grab them, and help them. The B's might find it hard to break out of the conditioning with regards to race, but the C's won't give a monkeys, as long as life gets better. If they see their kids playing with Syrian refugee children and having fun, you've won.