I can't see a way to do this without using the webframe widget, which btw is just an iframe.
This widget is specifically designed to show other webpages within a mashup, if you are running into problems displaying the page, then most likely no other way of displaying that page within some sort of other frame will work.
You can of course provide a link to the page and they can launch that page directly on a different tab.
If you need specific information, you could do some extra work and find out if there are APIs exposed by the other website and use that to present information with re-direct links.
