If you avoid bulk and expense for warmth and shelter, you will depend on your fire and your field improvised shelter, which can work just fine.

Be sure you have a good fleece or wool sweater (worn underneath your kayak shell, which i assume you have). See if you can fit in a heetsheets bivy bag and a balaclava helmet or watch cap along with gloves. Since you will be around a fire, wool might work better than fleece, although I personally prefer fleece.