You could use a deep red bulb (not the pinkish red) from HD with some mods- take a jar of model paint, red, and carefully paint in any pinholes in the coating on the bulb. Be especially sure to cover the glass near the base, thats usually the weakest part of the coating. Frequent inspection to the coating is a good idea as heat will sometimes make more pinholes. Try to get a low wattage bulb, maybe 25watt.
That said if you can get a *real* safelight you are better off.