1:60 is in America. The whole system works in a very different way over there.
It may be that a current single-pilot IR is not a requirement. I seriously doubt they would look at you if you had never passed an IRT. For a start I think you need to have done so to take a type-rating course. Lack of currency is always going to be an issue, but although I am willing to be corrected I don't think the IR needs to be current to start a type rating, and of course the type-rating test will give you a multi-crew IR.