It would not pass the non-obviousness criteria. Both gene editing and the existence of pre-existing organelle are prior art, and combining those would be obvious to anyone in the field.
Creating a food crop plant that contains these organelles will be an incredible challenge. They will need to solve dozens of difficult technical problems. It is obviously non-obvious.
yes...but one click purchasing got patented (by amazon), while purchasing existed and so did clicks...
You might not get the patent on the whole concept, but you can probably get many different patents on the details needed to make it work.