You're a missionary wherever you are.

In whatever community you're in.

You could be a missionary to the poor.. You wouldn't have to BE poor, but just be in their community..
Maybe not use your wealth. Live with them, but don't use your abundant cash for a new Jaguar to park outside your cardboard box.

Our church is called to be a community. Is everyone waiting for someone to come along who's just like them? We wouldn't do that if we were missionaries! We'd be reaching out, building bridges to people who aren't -just-like-us-.

I'm not up on church lingo, but that sounds missional.