Re: I should be so lucky
Here is how it is usually used:
A person is complaining about things. He is so animated in his description of his troubles that he doesn't notice he's about to step off the curb and into the street.
His companion pulls him back and says "Be careful! You could get run over by a truck!"
He says, "I should be so lucky!"
That means that being run over by a truck would be preferable to continuing on his current state of woes. As you say, it's used ironically. He doesn't really think it would be lucky to die and he's not suicidal.
It's generally used to talk about a bad thing that no one would really consider lucky.
Your use is not very natural. It WOULD be helpful to have a surge of adrenaline when you have a lot to do, so the ironic nature of the expression is lost.
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.