Continuity: one-way call sharing between two iPhones

If you have two iPhones, is there a way to set up one-way call sharing? Looking for this result:

• A call to phone A will ring A AND B,
• but a call to phone B will ONLY ring B.

So far, I've only been able to get all or nothing: both ring all the time, or only the phone being called rings. The reason I'd like to set this up is because I don't always have my work phone with me and I'd like my personal phone to ring when I get a call to that number. But there's no reason for my work phone to ring (making me think it's important) when I get a personal call.