Wish that post had been around a couple of years ago when I had the same problem... I'd no idea that the job could be done in situ.
Rather than take the engine out and repair, I figured a replacement engine from a breaker was the cheapest solution. Agree with you that engine swaps are a pain in the proverbial though.
Sorry I can't offer any advice (other than to talk to Deefer), but will be very interested to hear how it goes.