Re: Are these words used correctly in this sentence?
Well, pardon me for saying so, but it sound ridiculous unless you are entering a contest for the greatest use of fluffy words.
I think ineffable is too strong, and I don't see how inexorable can apply to a debacle, but debacle isn't the right word either. The strain on his wallet didn't lead to a debacle. You could describe the public response to his debauchery without contrition as a debacle.
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.