The job market for helicopters is hot, but only for people with experience - it's getting there that's your problem. When starting late, you need the qualification that is going to get you the most hours, and an IR ain't it, unless, as Bravo 73 says, you wish to go offshore.
I would do the FI thing myself, as there is a shortage of good ones - for example, there are two $100K jobs for Class 1 instructors in Western Canada right now.
There are lots more fixed wing aircraft, but with people like Loganair expecting you to pay 20K (pounds) for your type rating and OPC up front, and you don't get paid till you pass, I would tread very carefully!
Phil