you can pop out a door lock and take it to a lock smith. they should be able to cut a key for 20 bucks.

if you must hot wire, to start it, I would just do it under the hood and back feed power inside instead of trying to hot wire it under the column.

and yes pull the back seat out and you can tape a screw driver to the end of a broom stick. or if you have a small kid they can crawl through the opening and pop it from inside with a screw driver.