Does
: anyone know how to spread the hull to the deck and keep it in position
: long enough for epoxy glue to cure?

Two ideas:

- You can use some temporary braces to spread the hull, taped into place with duct tape of course

- You could use the CLC solution of a small piece of wood glued to the hull to which you screw the deck.

But the already posted solution of a few stitches sounds easier and lighter. Just think of them as sutures the doctor might use to hold together a laceration so it does not heal with a large scar.