Just had a quick butchers at an old LASORS, with an ICAO IR you have to do 15 hours instrument training, of which 10 can be in an FNPT2, plus the flight test, so I guess there's a bit of a spreadsheet required to work out your cheapest option!
My personal opinion is that this whole gaff costs a lot of money whichever way you do it, so why gamble with training - pay the money and do all your professional training at a well-regarded school in the UK. As I say, though, that's just my opinion, and I'm still looking for a job!
ppjn.com lists recruitment info, not always current for all airlines. Though if you're a couple of years away, the situation will be completely different when you enter the market.