Well that's about it. Since you have an established A. Ocellaris I would get another one as small and Juvenile as possible. It shouldn't matter if it's an orange or Black and White A. Ocellaris.
Some helpful hints on the introduction: I would rearrange the rocks as you introduce the new clown. This should convince the existing clown that she is in a new territory. You will see agression typically and this is normal. Watch them and have either a breeders net or specimen container handy to cordon the new one off so they can be near eachother without attacking.
You want to see charging behavior that stops short and the smaller addition to stop, present it's belly and to shiver. When you start to see this, it's a good sign and let them continue. If you see several says of non stop chasing and attacking, remove the female to QT for a day and then re-introduce her and that should help.
In general A. Ocellaris are pretty easy to pair, just watch them.