I fail to see the problem, sidecars have used oil absorbent for years. On a solo you can use double sided tape to secure it to the inside of the fairing and having oil absorbent lining the fairing must be better than nothing at all.

As regards unfaired bikes, well they will just have to have a covering around the bottom of the engine with oil absorbent inside.

Please note some of the absorbent pads absorb oil and water, these are useless. You must use the ones that absorb only oil.

The cheapest option when purchasing is for several riders to club together to buy a pack of 100 pads.

This may not stop all oil from getting on the track but if it saves one life then it can't be wrong.