With django
1.5 (at least) you can define the template you want to use for a particular modeladmin
see https://docs.djangoproject.com/en/1.5/ref/contrib/admin/#custom-template-options
You can do something like
class Myadmin(admin.ModelAdmin):
change_form_template = 'change_form.htm'
With change_form.html
being a simple html template extending admin/change_form.html
(or not if you want to do it from scratch)