If you can find the little screw on closeup lens sets that will fit the threads on your camera, then buy two sets and put matched diopters on both the taking and viewing lenses and you should be in business. It should be the lowest diopter for doing portraits as these actually shorten the focal length of whatever lens you put them on and you want to retain as long a focal length as practical for aesthetic reasons.

If your camera has the bayonet type filter mounts you may need to get the bayonet to threaded adaptors and buy the closeups to fit that.