There used to be a Marriott Concierge on this board. But I have sent that person a private message without getting a response a few weeks ago. So I don't know that the Marriott Concierge is active here anymore.
One thing you could do is get a Marriott credit card from Chase. That would give you immediate silver status without any stays. Then you could sign up for a gold challenge after that.
Please post your results. Thanks.