It takes seeds on my clivias grown indoors at least 10 months to ripen to red. If the plant is healthy, 10 seed pods will not hurt the plant, so I would leave them on. I've had plants flower before the pods are ripe. There are usually at least two or more seeds inside each pod. Sometimes you will see a pod start to split. That usually means one of the seeds is starting to sprout inside. If that happens, you should remove all the pods and harvest the seeds inside. There's a helpful description with a video that shows how you remove the seeds from the pod on the Clivia USA website.

By the way, I don't know what the paper towel method is for clivia seeds. They take so long to sprout, I doubt that would work.

Here is a link that might be useful: Preparing clivia seeds from Clivia USA

Thanks for the info and the link. Now I'm off to check it out!

How old does a plant have to be to produce viable seed without undue stress?

When a clivia blooms and produces seeds, it is old enough. All of my clivias that produced seeds produced flowers the following year. If a clivia with berries starts to look unhealthy, I would remove the berries. But I've never had that happen.

Great, Thanx for the info.