Is it possible to link to two separate PNR's to allow me to check a hold bag all the way through my trip with two separate Oneworld carriers?

I'm flying AA, IAH-DFW,DFW-LHR then CX LHR-HKG,HKG-BNE. I only have a 90 minute layover in LHR and don't think I'll make it through the re-check in process in time and so I am considering hand luggage only but as I'm away for a month would prefer to check a larger bag.

Any advice would be appreciated.