I think that it should be looked into in greater depth as to how oil can be reasonably contained in the event of an engine blow as when you fall off on oil it makes no damn difference wether it came from a classic bike or a modern bike does it?
I'd not heard of these absorbant pads but they do seem like a good idea that is simple to fit on a faired bike, the biggest issue is how to contain oil on a classic machine with no or little fairing without distracting too much from its original appearance.
Russ