You are just waiting London does not seem too bad releasing appointments some places you can wait a long time
if you get a response expect it to be the same nothing else they can tell you
I assume he has a Swedish visa
Consulate would need to agree to accept the case and of course they are not likely to be familiar with Pakistan documents
I have seen cases delayed but that depends where you are in the process and may be relative.
Your case was like trying to win the lottery twice, anyway that is history.
There is some paperwork you can do but I would focus on proving up your case.
It is extremely unusual to obtain a meeting waiver.
I am not surprised the K1 was sent back to die, it is going to be sometime before the CR1 interview so I would focus on getting more visits in.