They do have an interline e-ticket agreement with EK.



But, as you said, the connection time pretty much guarantees that the flight will be closed by that point. Even if not, there's a high chance that the EK flight may not even have availability on it to get interlined over, not to mention potential hesitation from whatever agent you speak to in getting this done, though the PSL in my experience hasn't been terrible about these kind of things usually.

A 60 min NS to NS connection in AMS should be very easy to do, especially coming from the UK with no passport or security checks. I'd be comfortable with the odds of it going in my favor.