1: I can't speak for the pigs, but unless your friend is a recruiter, you don't really know. It does not cost anything to ask. Unless you are going to fly, your vision would have to be pretty bad not to get in, and they can be forgiving of a bad past if it happened long enough ago, especially if you didn't go to prison and if you are honest about it. Hell they let my fat ass in the reserves, and I was almost 300 pounds, back in 91. Don't know if you don't ask.
2: Life isn't fair, nobody owes you anything, yes it sucks, but that does not change anything.
3: The door starts to close after a few months, after several years it is already closed, unless you are a Doctor, an tradesman, special ed teacher or other brutally in demand position, in which case you would not be in this situation.
4: The financial industry didn't put you in this situation, some people made a decision on the basis of what is best for them [like you would] that sucks for you. There is no collective borg like financial entity out there to screw your life. Except for those fucking Amish.
5: A multi year gap in a resume is a huge signaler. For whatever reason, you have not been able to get a job for the past few years, the question everyone who closely reads your resume is going to ask is why. Actually, at this stage, I am surprised they even bother to ask. If it were me, I would go, hmm has not been able to get a job in a few years, all those other people who interviewed him saw something bad, not gonna waste my time. And really why bother, when there are 10 resumes on my desk without such a negative signal.
There are ways of hiding gaps on resumes, but I can't see a serious recruiter not being able to see through it. A "Functional" Resume screams I am hiding a gap, unless you are switching fields.
Consider also, if you have not done anything in your field, how badly has your skills eroded. What have you done to keep up, and why should an interviewer trust your word instead of just getting someone who is fresh.
Hate to be negative, but that is how I see it, from one person whose testicles are black and blue from that Dom I call Life to another.