Ian,
I agree with Neal, that there is no conflict of interest. There could be some interesting situations, though, if a member of a Ross Society, for example, was interviewed at a Ross club that wished to totally redo the style of the course.
Now, I assume he would present his credentials, and a plan for at least sympathetic renovation. If the club was intent on blowing it out, they would probably retain someone else with similar ideas.
The borderlline area would be if he accepted a job to blow out a Ross. I can think of justifications for it - new highways require reconfiguration, already been changed, no documentation, etc. come to mind - that may make it acceptable in his mind to take the project under those conditions, but if I were he/she, I wouldn't want to attend the next meeting of the Ross Society, nor sit on their board!