Einstein said:So by example you may have to create some ridiculous unverifiable false assumption.
You could but, that is not the purpose of developing theories. You are still missing the point of being falsifiable. You do not intend to create something that IS ridiculous though, sometimes that does happen. You aren't always trying to understand something observable. Sometimes you are speculating on something unobserved and try to explain why it isn't if, other indications are that, it should. You develop theories to possibly explain it. Sometimes these may be far fetched or even fanciful, also known as SWAG... scientific wild ass guess. As long as there is a way to try to falsify the idea, it's all good.
Einstein said:Since anything based on a false premise would by definition be false.
This is true but, again, this is not the purpose of theorizing but, will be the result of falsifying. If your premise IS false, it WILL BE falsified and, the system works.