More and more, I'm thinking this is the way - but where are the top tanks coming from in 10 years?
I think that's the hardest part. Years ago I read so many radiator threads when either looking at forced induction options or just needing to replace my radiator. Anytime an multi-row core came into the discussion, they all seemed to devolve into overheating on the trail or overheating on the highway. The thinking 10 years ago was that the lack of any aero coverage under the body to force an area of low pressure resulted in high pressure under the hood, which reduced the airflow flow through the radiator. You have probably seen your hood get floaty from time to time
I've had classic vehicles that were much older with more miles on their original radiators. Even an early 70s FIAT 850 spider that was still running it's original radiator at 30+ years of age. Put on some trick heads and 4 sidedraft webers to double the power - still fine.
I don't actually think the Mopar radiator is a good quality radiator. 15 years is OK, but not good service life. The fact we can't find a reliable replacement today is an embarrassment with all the progress we've made in materials and manufacturing capabilities. Building a reliable radiator has been table stakes for 75 years.