I think the easiest way would be to use a PTC which could dump the energy from the capacitor, combined with an isolation change over relay - before component is connected the device checks voltage using a high impedance circuit and if >5V then it leaves the relay off until the voltage dro...
The manufacturers of aluminum electrolytics offer a myriad of different types, most identified by a 2 or 3 letter code. This is usually printed on the side of the capacitor body, along with the logo of the manufacturer. As an example, I've pulled the capacitor below from my "stock" to ...