They could have brought him back to life much easier and more believable, for instance:
Pt. one, we get a flashback of the explosion and Batman carrying Jason towards the jeep.
Pt. two, we see Jason's funeral. After the funeral is done, we see two unmarked helicopters (Some secret US Goverment agency, sim. to the cartoon series). They excavate Jasons body, and fly off to a remote place which turns out to be a secret US goverment base with a "Lazarus pit". Jason is placed in the pit and revives. In the proces he might have lost an arm or a leg, but this can easily be replaced by robotics.
Pt. three, US goverment trains him simulair to what Talia did. And wan't Jason as a back up plan if they ever need someone to bring down the mighty Batman.