Yeah, that's kind of what I was thinking. It has the added benefit that the user (there's only one) can just keep using the interface that she's comfortable with.
This would buy me time to rewrite the GUI in Perl/Tk. Of course, any new feature requests would be developed for the new GUI, giving her an incentive to switch :-)
I'm really intrigued by dwildesnl's thought on turning it into a web-based app, but I'm more comfortable in Perl/Tk - especially as I hope to have a quick turnaround time on this.
Perhaps for some of the other apps... Time to do some research!