I think you'll find there isn't one that's in any way sensibly priced. There is one we found but for my 7 year old Optimax 225 with just 208hrs, the price was about £1,000 per annum. I have had serious discussions with several companies about starting such a scheme, but the insurance companies (that underwrite the warranties) are not interested.
Good luck anyway.
You get what you settle for!