How can I only display ForeignKey in a ModelForm, not make it editable?

I have the following Models and Forms:

#models.py
class NetworkDevice(models.Model):
    user = models.ForeignKey(User)
    device_name = models.CharField(_('device name'), max_length=100)
    ...

#forms.py
class NetworkDevicesForm(ModelForm):
    class Meta:
        model = NetworkDevice
        fields=('user', 'device_name',...)

'...' are some fields I left out, since they are not important for this. I want to create a formset based on my ModelForm:

#views.py
in some view:
    network_device_formset = modelformset_factory(models.NetworkDevice,  
         extra=0, form=NetworkDevicesForm, fields=(
         'user', 'device_name', ...))

And I display it like this in my template:

<form action="{% url 'some:action'  %}" method="post">
{% csrf_token %}
{{ devices_formset.management_form }}
<table>
{% for form in devices_formset %}
    {% if forloop.first %}
    <thead>
        <tr>
            {% for field in form.visible_fields %}
            <th>{{ field.label }}</th>
            {% endfor %}
        </tr>
    </thead>
    {% endif %}
{% endfor %}

    <tbody>
        {% for form in devices_formset %}
        <tr>
            {% for field in form %}
            <td>{{ field }}</td>
            {% endfor %}
        </tr>
        {% endfor %}
    </tbody>
</table>
<input type="submit" value='{% trans "Save" %}'/>
</form>

Now this will display my ForeignKey with an HTML select tag. I don't even want to show all the choices there however. I just want to display the key for the according instance. I can disable the select tag:

class NetworkDevicesForm(ModelForm):
class Meta:
    model = NetworkDevice
    fields=('user', 'device_name', ...)
    widgets = {'user': widgets.Select(attrs={'readonly': True,
                                                      'disabled': True})}

But then I get errors on the validation of the user field. Guess I could overwrite the validation for this somehow. But still this would display all the options for the foreign key in the generated html. Is there no way I can just display the value in my template without specifying it in the ModelForm, since I don't want to edit it. Some magic like:

    <tbody>
        {% for form in devices_formset %}
        <tr>
            <td>{{ form.user }}</td>
            {% for field in form %}
            <td>{{ field }}</td>
            {% endfor %}
        </tr>
        {% endfor %}
    </tbody>

Except that {{ form.user }} is not working. Can I access that somehow in the template? Hope I was clear about what I want to do and it's possible.