I'm unable to remove the custom code. The same situation works for other pages however.
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I did write a small work-around though.
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I linked the dropdown to a ListView and then I have some custom jscript which parses the appropriate values and links them together in a function:
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// SID1: SharePoint ID for first item.
// SID2: SharePoint ID for second item.
// field1: SharePoint field name for first item.
// field2: SharePoint field name for second item.
// list: The list where the two values will be linked
function linkIDs(context, SID1, field1, SID2, field2, list) {
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console.info("linkIDs:\n\tSID1: %s\n\tSID2 %s\n\tfield1: %s\n\tfield2: %s\n\tlist: %s", SID1, SID2, field1, field2, list);
var clientContext = context;
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var oList = clientContext.get_web().get_lists().getByTitle(list);
var item = new SP.ListItemCreationInformation();
var oListItem = oList.addItem(item);
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var Item1LookupField = new SP.FieldLookupValue();
var Item2LookupField = new SP.FieldLookupValue();
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Item1LookupField.set_lookupId(SID1);
oListItem.set_item(field1, Item1LookupField);
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Item2LookupField.set_lookupId(SID2);
oListItem.set_item(field2, Item2LookupField);
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oListItem.update();
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clientContext.load(oListItem);
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return clientContext;
};