You can get a KKW rank using Palgwe forms. We don't have the Taegeuks at my school.
Sure you can. You can get KKW rank if someone with a 4th Dan or higher signs off on the paperwork, even if you don't know ANY forms.
That doesn't mean you SHOULD be able to. Just that you can.
The KKW requirement is that you know the taegeuk poomsae. If you do not, then you're not meeting the (very) minimal standards, and you do not deserve the rank.