Well, not without considerable cost. First they'd have to hero their character and role-play well enough to get the honorable combat skill. Then they'd have to duel and probably die to most people in the game. One combat session might not be sufficient to test out what they want to test out, so chalk up multiple deaths.

In retrospect, the worst thing about it would be the ability to discover things about other characters. Their skill%s. Legacies. Etc. It could always be designed so the caller gets "stripped down" versions of "score", "prac", "skills", etc., but then that would put him at an even more severe disadvantage since he wouldn't know whether he could rely on certain skills.