You can fly all you want at a NON-sanctioned AMA field to your hearts content, but if you kill someone with your plane or damage property then YOU will be held liable. If you fly at an AMA SANCTIONED field without a turbine waiver then I suspect that you will be banned from that facility indefinitely, because if you crash their then they will be at fault and not covered for your negligence. Pretty straight forward.

If I were you, I would train, get proficient, go to a jet meet and get signed off. Its an easy process and even easier with the new rules. Then you are covered no matter what. There are tons of people on here willing to sign you off, providing you prove proficiency.