I am actually a super quiet trainer with almost every species of animal I train. Most critters are pretty visual and pick up super quick without an audio cue or marker. The clicker or other marker is only relevant is behavior is happening super fast and the bunny is onto something else before you can reinforce. Or the animal is far away from you. If you are able to deliver the reinforcer in direct conjunction with the behavior, the marker is not necessary. So for me I am right there ready and waiting with a treat the moment my rabbit does what I want so no need for the clicker. My hand moving towards my rabbit with the treat lets her know she did it correctly. I also tend to use visual cues instead of verbal.
It is great that you are working on targeting. The target can be used to crate all sorts of behavior…like going through the tunnel, recall, etc. I use an acrylic one. Most animals can learn to target in one session. Then use it to train other behaviors. The target helps you get the action so you can reinforce it. Then you start associating whatever cue you want and gradually phase out the target. Hope that helps!