I never traded long-dated options when I was in finance, but anything with longer than a three-month maturity was crazy expensive in terms of the spread you'd pay. These are not liquid instruments.

It's been a while since I've done the maths, but I'm pretty sure it'd be cheaper to buy shorter dated puts and roll them over on expiry. Which would still be very expensive.

I used to do options in the end 90s and back then long term options were crazy expensive. You need a lot of capital for such a strategy.