Product layout update depending on attribute set

[gumideQ]

I want my product belonging to attribute sets X use a different template without setting the layout update in all product one by one.I created this new handle in the layout file :\[code\]<product_view_bis> <reference name="product.info"> <action method="setTemplate"><template>catalog/product/view7.phtml</template></action> <block type="core/template" name="replacements" template="catalog/product/replacements.phtml"> <block type="replacements/replacement" name="replacement_options" template="catalog/product/replacement_options.phtml"> <action method="addOptionRenderer"><type>select</type><block>replacements/options</block><template>catalog/product/view/options/type/replacement.phtml</template></action> </block> </block> </reference></product_view_bis>\[/code\]Then I extend the Related Helper (Mage_Catalog_Helper_Product_View) to fit this with :\[code\]if ($product->getAttributeSetId()==X) $update->addHandle('product_view_bis');\[/code\]This should replace the catalog/product/view.phtml with my own file which call some custom blocksIt doesn't work at all. But If I put this :\[code\]<reference name="product.info"> <action method="setTemplate"><template>catalog/product/view7.phtml</template></action> <block type="core/template" name="replacements" template="catalog/product/replacements.phtml"> <block type="replacements/replacement" name="replacement_options" template="catalog/product/replacement_options.phtml"> <action method="addOptionRenderer"><type>select</type><block>replacements/options</block><template>catalog/product/view/options/type/replacement.phtml</template></action> </block> </block></reference>\[/code\]Into the product Custom Layout Update in the backend it works.Can anyone help me ?