[streetcat1]

You cannot.

A "validated" idea is product that someone will pay their hard-earned money for.

Moreover, the true cost of buying a product, is the actual integration into the current workflows, internal processes changes, etc.

Since most people only change when they must, they will not buy a product even if they approve it and like it.

Hence, before the product is ready, what you getting is only opinions.

And, there is also a scale issue, since to get a statistically significant answer, you would need a large sample.