If this is an practical, rather than academic exercise, then you have received very sound advice here already.
I can't imagine undertaking a major recertification project for a product of US origin outside the FAA system; for reasons of cost and practicality. The reason for this, is the simplicity of the system and the cost effectiveness of access to individual FAA designees for every discipline required for the complete certification package.
The aero-diesel engines that are currently in test, will never be a viable proposition until they have recieved certification for the entire package to be installed in the aircraft, essentially as a turn-key modification. Unless there is potentially a large production run to absorb the certification costs, a mod of this nature is (generally) prohibitively expensive. This indicates that the initial installation efforts will be aimed at models with large fleet numbers, and particularly commercial and training operators.
I have been involved in a large number of mods including re-engining piston and turboprop aircraft and some very big helicopter programmes. The initial planning and co-ordination between the engineers performing the certification functions and the certifying agency is perhaps the most important part of the whole project.
If this were to be an academic exercise, then it is worth looking closely at the FAA system, as all the data you could require is available on the Internet (FAR's, Advisory Circulars, etc).
Not an insurmountable problem, simply an expensive one!