Hi Hazelnuts39,
Your memory regarding the FADEC & ADIRUs 1 & 2 is correct. The suggestion of somehow using an array of pitot tubes in the engine nacelle as a backup to the normal 3 fuselage mounted pitots would apply to future developed aircraft and engines. I would guess it would depend on the ability to both correlate and then integrate them into the overall aircraft monitoring system. It would require extensive testing to determine if this "backup" system would be operational and not develop icing should the normal pitots fail for openers. I do suspect searching for a solution is being worked in the industry to prevent pitot problems leading to instances of UAS on aircraft being developed or in the conception stage.