Tricks to start a truck without the programmed computer chip key...?

My boyfriend has a 2003 or 2004 Mazda B2300 truck, manual transmission. He lost his one and only key and has given up any hope of finding it. He couldn't have a normal key cut in the past because there is a computer chip in it. He had a locksmith come out that said he could do this but was unable to successfully program the chip. He did cut him a key that works for the doors but not the ignition. Does anyone know if you can push start it with the door key? Otherwise he will have to pay several hundred dollars just to have it towed almost two hours away to the nearest Mazda dealership. If he could at least get it started and drive the truck there it would be a huge help. Any tips or advice would be greatly appreciated, thanks!