Dustin Diamond was Developing Ad Campaign with Screech’s Robot Before Death

Dustin Diamond was working on a “Saved by the Bell” reboot of his own before he got sick and tragically passed … bringing back Screech’s sidekick for a series of insurance ads.

Dustin’s friend, Dan Block of Insurance King, tells TMZ … they’ve been working on building their very own Kevin — Screech’s A.I. creation on the original series — over the past year.

We’re told the plan was to shoot a series of commercials with Dustin and Kevin … where he introduces the robot he built to help save…