In the end, and after much consideration, I decided to go for the Delkevic 6 into 2 original exhaust replica.
In fact, it is about to be delivered to my home in Greece, having travelled all the way from the UK (and presumably to the UK from China).
Who knows, later on, as funds permit, I might try another, less conventional exhaust system.
Thanks for all your great help!
ICOA # 6309