The OP said s/he wanted to make EXP and maximize miles. Under the AAdvantage program one does not earn the 100% platinum bonus on flights carrying BA or JL flight numbers. Thus e.g. CDG-NRT-SIN, say on JL metal will earn 14,058 EQP and 11,715 spendable miles, while CDG-HKG-SIN on CX metal will earn only 11,337 EQP but 17,006 spendable miles, i.e. more miles for less flying. That's why I'd try if possible to link as many BA- or JL-operated flights to AA connections, in order to get the AA code (hence AA earning rules) onto the partner plane. The AA RTW desk is more than happy to oblige on this - more revenue for the airline.

I do agree that there's a lot of fairly hectic flying involved, but 40K+ BIS miles in less than six weeks is going to be a slog no matter how you cut it. I'm going to be doing a 34K mi RTW in 12 days starting in about 3 weeks, and even though it's in F and J it's still going to be very tiring.

I've done the MCT-xLHR-LAX trip and for AAers the LAX-LHR or v.v. segment is what e-VIPs were made for.