I don’t think the Brewers would offer him a long term contract. Maybe a 4-year contract for $96mm with deferred payments for 2-years at $3mm per year if he opts out after year one otherwise it is $4mm per year for 5-years. Year one at $17mm, year two at $19mm, year three and four at $20mm each year.
The Brewers wouldn’t be able to give Hader a QO after year one also.
I don’t think this makes sense for the Brewers but this should be close to what it would take to sign him. I am not sure this makes much sense for Hader either.