Form Selector on Bulk Edit

For bulk edit, I want the user to be redirected to a different form other than the one pulled from UserEntityUISettings. I am using

Xrm.Page.ui.formSelector.items.get(itemId).navigate();

However items collection is empty when Form Type is 6 (bulk edit). I don't want to use direct navigation, because of other complexities involved with it in editing and saving bulk records. Is there any alternative?