Given that the Wests Tigers have the Tigers name nailed-down, what about a soft re-brand?
If Brisbane Easts took a controlling stake in the Broncos, they could keep the Broncos name but refresh the logo & change the colours to maroon & ORANGE - maybe keeping yellow just for the odd heritage design.
After all, the Broncos have recently been minimizing the amount of yellow in their jerseys, so that would make a soft re-brand like that a bit easier.
And one way that could be justified is that the Titans use yellow & the Dolphins use gold (not to mention the lemon used in Cowboys jerseys as a slight accent), so orange would be a sunshine colour that's unique to the Broncos... and fits with the new Tigers ownership.