That sounds interesting, but make sure it's only funding one-offs.

We don't want a repeat of lotteries funding schools, where that money becomes expected

Making it exclusively one-offs doesn't address that problem at all. What it does is aggravate the problem of people going out looking for someone they can fine to cover their budget.

A construction company's entire business consists of one-off jobs. They expect the money to come in anyway and they're built to rely on the fact that it will. Other organizations funded through one-offs are no different.