Going rate for pitchers in Strop’s class last year (Cishek, Shaw, McGee, Reed, etc.) was 2-3 years at $7-$10 million per. So a bargain would be somewhere significantly below that. I don’t think Strop would accept that.
The reason to extend Hamels is because it’ll likely get his AAV down to $15 million or so to help the luxury tax. Otherwise, they’d just pick up the option. With Strop, I don’t think there would be any AAV savings.