Is that official trim stab? I've never heard of a requirement for survey time from BAS.
No, not official - just my supposition. But I fly single-pilot survey at the moment and in our setup anybody without either type-experience or survey-experience would be a passenger. I'd guess that given the number of applicants BAS gets they wouldn't take somebody who brings nothing to the table in terms of relevant experience.
BTW, does anybody know what sort of survey they do?