Go with the rubber bands.

You can get #64s by the pound at any decent office supply. Throw the used ones out after a few uses.

It's easy or not to modify a model depending on the design of the fuselage just forward the leading edge of the wing. Also depending on your model building skills. You've got to create some type of latching at the LE, and a means to hold the TE down. Not too hard for most who've built models, but not easy for most who have yet to buy any modeling tools or wood.