Is there any way to integrate a custom HTML page into a page with the NetSuite menus via Suitelet? To me it seems it's either serverWidget.write() or serverWidget.writePage(). I've heard of people using iframes, but I wouldn't think that's a good design decision unless it's unavoidable. The page I'm working on is a flow diagram and API's are not going to achieve the right look.

usually an inline html field