If you are using single-deployment, connect the charge to the apogee or drogue channel of the altimeter, not the main.
With very little additional effort, you could go dual deployment. You just need to leave enough room under the ebay to have 10-20 feet of shock cord joining the engine can to the ebay. Use the "drogue" channel to blow off the engine can at apogee. You don't really need a drogue chute as the shock cord itself has a modest amount of drag and the rocket is going to fall on its side once separated. The "main" channel blows the main chute at some predetermined altitude and you don't have to walk far. If you do this, secure the nose cone with shear pins so the shock of the separation at apogee cannot throw out the main. 2-56 nylon screws are commonly used as shear pins and take around 25 pounds force per screw to shear. There are calculators that tell you how much BP to use to achieve a given pressure and pressure times the cross sectional area gives total force. Shoot for at least twice the force need to shear the pins (2 x 25 = 50 pounds if using two shear pins). For smaller rockets, you can use the square styrene plastic extrusions which take less force to shear.