I don't know NSA's rules on CRs, but locally some of the leagues and tournaments have a bat-the-roster rule and a last-out as CR rule. This local rule is sometimes elaborated on to allow skipping the actual last out if she is a pitcher or catcher, and "last due up" can be used if you run out of "last out" players (such as in the first inning). I take it NSA has a CR rule that involves active players (like the last-out CR rule does). If the local leagues want to allow skipping under defined circumstances (such as you describe), I see no problem with it.
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Tom
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