Not to mention changing materials would likely have continuous costs, and will impact the materials properties and longevity - potentially in ways that just don't add up to a feasible product.

And then there's the fact that this is a hugely international business, so unless we convince the whole world to do this, we'll be impacting supply lines and flexibility there too.

The whole undertaking seems like it would have an absurd scope - just to avoid adding IR filters that cameras need anyhow to achieve accurate color reproduction, and therefore most cameras already include!

No. That's like saying thieves are the problem so tie up the hands of every would-be thief and don't bother lock doors.

It's much simpler to lock doors, and that prevents thieves 99.9% of the time.

The filter IS the lock. It can be circumvented by the determined but it prevents most of the abuse most of the time.