Magento 1

I want to delete all products which do not have a manufacturer with ID 1 or 2 or 3. This will be about 250000 products, so I have to use direct SQL. I wrote this code to get the SQL query. So I have the SKUs and could run a delete on those in catalog_product_entity. Is there a better way? Maybe not going over sku, but directly using the manufacturer IDs?

$idsToKeep = array(1, 2, 3);
 ->addAttributeToFilter('manufacturer', array('nin' => $idsToKeep))->load();


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