One other thought.....I know money is a tight spot, but an immigration attorney would also be very good here and I think we would be remiss in not at least saying it as necessary advice to the OP.
Probably the best advice to offer him.
OPs main problem looks like proof of a bonifide "loving" marriage. Be nice if he had the bucks to hire one but to me it would be much more productive if he came up with a couple grand in the next few months and went back to PI for a respectable time [Like a month] and attend the interview with his wife.
Been there! Didn't do that and was denied! Different circumstances tho.
Only good things will come of doing such.
It will show more proof they are for real and help pass the interview or he'll find out a one time visit to marry and chatting and caming really wasn't enuf to get to know his lady that well.
That in itself wouldn't be a denial but I'd agree that only seeing her once in person combined with this situation and I just don't see how they'd make it through the interview successfully
