The US is not known for its distaste of hypocrisy. It has no problem requesting a waiver even if it wouldn't grant one. In the case of the Georgian diplomat you referred to, the case was somewhat different in that he was driving drunk, but I take your point.
I'm sure there are more cases, but the last time I found the US granting a waiver to the UK was in 1940 when a US diplomat was a spy for the Nazis - and if they had been able to prosecute him, they probably wouldn't have waived immunity. That's a pretty high bar.