With stopovers at PEK, HKG (counted due to openjaw) SEA, JFK and MAN, the miles would be computed as TLV-PEK//HKG-SEA-JFK-MAN-TLV, which GCM says is a tad over 19K miles, i.e. a OW130J award.

Assuming this is after RJ starts its HKG service, I'd imagine the actual flying route to be something like be TLV RJ xAMM RJ xHKG CX PEK//HKG CX xNRT AA xORD AA SEA AA JFK AA xLHR BA MAN BA xLHR BA TLV.

I don't think AA will let pax use the AA codeshare on BA's JFK-MAN but I could be wrong. They might backtrack you to ORD for the AA metal ORD-MAN flight though.

If this is before RJ starts serving HKG they might send you TLV RJ xAMM RJ xBKK CX xHKG CX PEK. I'd be skeptical that they'd start by going TLV BA xLHR BA PEK although it's also possible.