Saw a youtube the other day. Wasn't scroll saw, but noted his glue technique. He put strips of glue spaced, then put CA glue 'crazy glue' in the spaces. He held it in place enough for the CA to grab. CA glue can be used as a two part, so the glue in applied to one piece and the instant set is applied to the other piece. It eliminates the pin nailer, clamping, or putting weights on the project.
Filed this technique away in my brain to use if I'm short on clamps or a pin nailer isn't available. One additional missed 'clamping' technique is taping a few places. Little off track from glue. I'm covering some of the responses that could or couldn't be used from lack of equipment or space. RJF