Hello Jim and thank you for your very interesting comment!
I guess that in the end, we will end up with an open-ended conclusion as it would be probably impossible to establish certainly how many Pata swords had European and how many had Indian blades.
What is certain is they had both types of blades, and they evolved over time. It is quite possible that the earlier Patas had more rigid imported blades but then they evolved and so did the fighting style towards more flexible ones. If you are looking at the modern day Patas, they have a blade that is so flexible that it has become completely ineffective for a real battle, as it cannot deliver neither a thrusting nor a slashing blow strong enough to incapacitate an opponent.
However, I don't think that is really that important to reach a clear cut conclusion, as such a conclusion will carry little if any practical value.
I think the process by which we are trying to reach a conclusion is much more important than the conclusion itself, as this process helps us learn and understand more about this subject.
PS: Now, while I still think that Jens' blade and mine are Indian, I believe that Kubur's blade is European, but has been decorated with some North Indian symbols.