I think that we should be able to remove and put back on supressors after spawning in. You equip it in your loadout as usual. You spawn with if off and press M to put it on and take it off. So you can be stealthy at times but if you want more damage to take out a larger group of people you can take off the supressor.
You can only put on and take off the supressor you have equiped. Even if you have another one unlocked, you must equip it.