I'm contemplating of doing some delivering/proper shopping from japan - but I may not be able to catch the direct flight back.

As JL provides more decent Baggage allowance, does anyone know what happens if I try to transit to CX (eg. NGO/KIX-(JL)-TPE-(CX)-HKG? Will I be able to check through 2x 23kg in NGO/KIX all the way to HKG? I've read reports on other threads (not JL-CX) that the first airline rules, but I also remember a friend was having problems checking HKG-LHR-EDI (CX-BA).
Obviously needing to recheck in LHR causes most of the problems, but is JL-CX thru check ok (with a baggage allowance >>CX)!?