"Bringing PERS to the table" with current union members will have absolutely no effect on the contracts with the PERS members already retired or vested.   

That's like having the current car buyers getting to take back the car you bought last year.

Three Supreme Court cases have pretty much settled that.  You are just  going to have to wait for the vested and retired members and their spouses to die.  

Or go kill them yourself.  

They are going to get what the past Governors and Legislatures agreed to provide starting 30 years ago.   They don't have to give it up just because those Governors and legislators were stupid or just wanted to kick the can down the road until they were out of office.