A practical approach is to layer the images and mask them together manually.

In Photoshop or similar software, create a new document at the same size as the source images, then place each shot on its own layer. Add a layer mask to each layer and use a soft brush on the mask to reveal or hide parts of each image until the objects combine the way you want.

Because your camera is fixed, the layers should align well. You can reorder layers to control which objects appear in front. Using masks rather than erasing pixels lets you refine edges and preserve the natural blur already present in each shot.

This is essentially image stacking for compositing: you selectively keep the sharp and blurred areas from the source frames where they look most believable. Careful masking around overlapping objects is the key to maintaining realistic depth of field.