Sorry, i thought you wanted to remove the header completely. If it's just a case of hiding/showing specific elements in the header based on the page, you could add some logic to show/hide for specific pages?
{% if page.url == "/bob" %}
// wrap around navigation block
{% endif %}
{% if page.url contains "bob" %}
// wrap around navigation block
{% endif %
Or if you have a child page of 'members' for example and any page inside should not have the navigation..
{% if request.url contains "members" %}
// wrap around navigation block
{% endif %