What could I expect to change in my daily working life by joining your "new model union"? Unions got buy-in from workers because they offered tangible benefits to workers. Shorter days, medical care, better pay, and so on. The items you list are public policy concerns that align well with a variety of advocacy groups. In virtually all cases, a specialist advocacy group seems better-suited to addressing the problem th…
The scope of this is so diverse no organization, union or otherwise could advocate for all this to the satisfaction of its constituents.
"Counterbalance corporate interests"
What is that? There's really only one unifying corporate interest, and that is to profit, which is generally speaking a Good Idea.