Wholesale deal with Broker who is not investor friendly

[Natalie C.]

A Realtor family member in Sacramento, CA brought me a property as a private deal to flip. I live out of state and want to wholesale the home. Unfortunately, the Broker will not allow "and/or assigns" on the purchase agreement. My family member wants to keep in compliance with his Broker's request. Is it possible/legal to have a completely separate contract from the purchase agreement stating (in fancier language than this) "Investor is to sign the purchase agreement with Realtor present and pay the wholesale fee within 48 hours"?