Perch Content Custom - Filter within Repeater

I have a template which creates a list of staff members.

<div class="class_staff_area">

<h2><perch:content id="teachertype" type="text" label="Staff Type Heading" required="true" title="true" /></h2>

<perch:repeater id="class_staff" label="Staff Photos"> 

<div class="staffmemberbox <perch:content id="classnamestyle" type="select" label="Class Name"
options="reception, yearone, yeartwo, yearthree, yearfour, yearfive, yearsix" allowempty="true" required="false" suppress="false"/>">
 <perch:if exists="staffmember">
    <a href="<perch:content id="page" type="pagelist" label="Page" />">
    <span>
    <img src="<perch:content type="image" id="staffmember" label="staffimage" width="200" height="300" crop="true"/>" alt="teacher" />  </span></a>
    </perch:if>

</div>
</perch:repeater>

</div>   

Each member of staff has a class assign by perch. This work great for displaying all staff members on a staff page.

I am trying to share the content on another page but filter on the "classnamestyle" using:

<?php
perch_content_custom('Staff Area', array(
 'page'=>'/staff/index.php',
 'template' => 'extras/classteachers_small.html',
 'filter'   => 'classnamestyle',
 'match'    => 'eq',
 'value'    => 'reception',
   )
);
?> 

But because the individual filter is within the repeater then nothing shows on the page. Is there any way I can filter on items contained within a repeater?

Richard