I know it is a crazy thing to bring a 23 year old speakers halfway around the world, I am now a happy person. I do understand parts could be failing. Together with my friend who owns the same model ( the Corinthian I), we have spare drivers, no doubt they may not be as closely matched as the original install, this will ensure the speakers can operate for a long time.
I would not worry that things will be failing unless you are driving them super hard.
I am sure there are many better speakers around, just sharing my experience.
There are not many speakers that were/are better. I don’t think is is crazy at all to have seeked them out and shipped them (1/2 way across the flat earth.) ;)