Hey there,
I haven't been on for ages and was surprised you responded to such and post. Cheers. So, it's moot isn't it, because as you said, and I subsequently found put, the WEP is due when you are entitled to the pension. Whether you take it or not is irrelevant.
And I did miss for the deadline for the lump some. My initial message was unclear. By the time my UK pension is collectible, by then I will have had 4 years WEP free US pension. That's one of the reasons I took it early. I briefly thought about going back to work to get some more US quarters but I rolled over and went back to sleep; I'm not that desperate.
Take it easy and thanks the helpful posts I have seen from you.