Bronze liners are used in high production shops. They are fast to install, and they do follow the original guide geometry, keeping the seat concentric with the guide. However, they are thin, and the sizing balls used to swedge them into place is a little hokey in my mind.
I don't think you have enough material there for a sturdy bearing surface. Personally, I think a hardened 1/2 inch guide insert is the way to go.
Bronze must be honed in my mind to leave a cross hatch for a little oil to lubricate.