Will adding these flights to my OneWorld RTW itinerary invalidate it?

Hi guys
I booked a rtw oneworld flight in economy online.
I have only 5 flights in my itinerary.
SYD-ICN
ICN-HEL
HEL-MXP
MAD-JFK
DFW-MEL

i want to add segments to the flight.
I want to add a JFK- MCO flight
And a MCO to DFW with less than 24 hour stopover.
and add a domestic connection feom Mel to Darwin with a less than 24 hour stop-over. Is this possible?
And another domestic leg before Sydney from Adelaide with a less than 24 hour stop over.

Do the domestiic segments break the rules, or because its less than 24 hours its ok?

Im aware its a bit expensive to make changes to an economy flight, so weighing up my options.
Is the cost 9k service fee plus 6k per flight added?