Seems to me like your best (only?) option is to do the modular course:
1. ATPL groundschool course + exams
2. Simultaneously build TT to 150
3. Do CPL modular course
4. Do IR modular course
If I wanted to keep the cost of the ATPL groundschool down, I'd do a correspondance course. Also you can do your hour building abroad - do a deal with a school in South Africa/ USA/ Oz/ NZ where you can pay for 100h or so in a block. Or you might want to do that in the UK.
The CPL course may be done abroad- there are two schools in Florida who are approved to do this (see
http://www.srg.caa.co.uk/documents/s...provedftos.pdf ). You may be able to keep some of your costs down by doing the CPL course there.
The IR course needs to be done in the UK, and the same link lists all the places where you can train for the JAR IR.