Override cart controller twice or only override /checkout/cart/delete

Question

In a shop using Idev_OneStepCheckout I need to override the deleteAction. OSC doesn't do this, but it does override Mage_Checkout_CartController, only for the _goBack() method. The shop also has a storeview that uses the standard OnePage checkout from Magento.

So, unfortunately, I can't do:

<frontend>
  <routers>
     <checkout>
       <args>
         <modules>
           <MyNameSpace_MyModule before="Idev_OneStepCheckout">MyNameSpace_MyModule_OneStepCheckout</MyNameSpace_MyModule>
           <MyNameSpace_MyModule before="Mage_Checkout">MyNameSpace_MyModule</MyNameSpace_MyModule>
         </modules>
       </args>
     </checkout>
   </routers>
 </frontend>

Well, I can, but my module isn't called in the OSC case. Disabling either makes it work for the checkout in question, so I know my code is correct. Do I have to resort to a rewrite of /checkout/cart/delete for the onepage case or is there a more elegant solution?