If you have full leaf springs under the Excursion, then you might not be happy with the side to side 'wiggle' of a car like suspension with coil springs.
I am glad to hear that you survived the Excursion rolling over! Even happier to know that it is repairable. Thought it will probably have a 'salvage' title, and most insurance companies will not offer full coverage on a vehicle with a salvage title on it. Check first. .
You can keep the tuner and install that into any Excursion. The tuner is like leaving your cell charger in the car, then need to give it back to you.
Good luck,
Fred.