Before transitioning completely to using my DSLR to digitise/scan my film, I had first experimented with methods of scanning the full borders using my Epson flatbed scanner. I have now sold that scanner, but the methods I had tried were limited to placing the film directly on the scanner glass. However this is not ideal, even if you tape the film down to combat the lack of flatness which would result from scanning the film without a holder. The reason is that flatbed scanners such as this focus a few mm's above the glass, and the results would be out of focus. Thus, I gave up on this method almost immediately. Effectively, you would need to place an extra piece of glass, ideally in a custom holder, and then tape it down onto that. Alternatively, you could use something like Blu-Tack to "hover" the film a few mm's above the scanner glass, but then you are left again with the issue of alignment and lack of flatness.