Replacing a Portion of the First BD Chapter.... Is it Possible?

The first chapter of this Blu-ray plays an Overture with a blank screen. Before ripping it to the hard drive and changing some menu elements, the Overture was a separate mpls file that you could not access with a standalone player. I fixed that, but the blank screen for that first 2:27 is really boring. I muxed together a "title card" of sorts to replace it, but I have NO IDEA how to actually do it.

Can someone help? I'm always willing to try and learn.

Thanks for reading!