Can you coach a Little League team and act as the umpire without getting hassled for it by Karen, who is the Team Mom for the other team?
No, you can't. Ir's a fundamental conflict of interest and your impartiality will be suspect even if you do act fairly and impartially.
It's not too soon for you to come to an understanding that the primary attribute an appraiser sells is their objectivity and impartiality, and their complete disregard for how the deal turns out or what direction or outcomes any of the principals want. It is not your value conclusions or your signature at the bottom of an appraisal report that is marketable. What you really sell is your role as the outside party, the disinterested 3rd party opinion, the apathetic weigher of facts. You wanna be Spock, not Kirk.