Lensman,
I can't really answer your question, and I do know it will certainly be more difficult to get the job (and in some airlines impossible), but with your income you have already beaten the hurdle that strikes down most of us. If I was in your shoes I'd just go for it - if at the end of the day you can't get an airline job, so long as you arn't in debt from the course, then I don't think it would actually be badly spent money.
I know that probably sounds crazy, but the process of getting an ATPL and the potential options it opens would be a hell of an experience. If you aren't ending up in massive amounts of debt as a result it can't really be considered a terrible move (unless of course you can think of better things to spend the money on
)
As I understand turboprop jobs may be easier to come by at your age, and are arguably closer to the concept of flying than your 737/A320 jobs are.