Dickon,
I don't think many people here will disagree with you that the JAR ATPL exams are not very practical. Unfortunately they are just something you will have to do at some point if you wish to fly in Europe.
The sooner you start, the sooner you'll finish. I did mine in 8 months whilst holding down a full time job so they can be done reasonably quickly if you have the motivation. Once it's all over you'll be glad you've done it.
I'm currently finishing off my CPL/MEP (the fun bit of the JAR training!).
Best Regards,
54.98N