And re-issuing on BA stock runs the risk of re-pricing by the BA tariff gnomes to include horrendous fuel surcharges throughout the itinerary. That's why people are having AA do the plating in the first place.

If your first flight isn't until June 2009 then it sounds like re-issuing is not the case, it's refund and re-purchasing. Doing that on BA stock will almost certainly lead to significant surcharge imposition. I presume it was a 20-segment ticket?