I'm pretty sure I read all of them have survive forms.
I guess they all must have one considering that any of them could have used any of the survive cards, but as far as official designs/figures go, it's just ryuki, knight and the three I mentioned. The Japanese wiki also lists the forms that have appeared outside of the show and there is nothing about any of the other riders' survive forms appearing anywhere.
http://ja.wikipedia.org/wiki/仮面ライダー_(仮面ライダー龍騎)#.E5.8A.87.E4.B8.AD.E6.9C.AA.E7.99.BB.E5.A0.B4