There is no one that knows this area like byways. I was on this ride and I can tell you it's amazing. I've been on other rides that he's put together as well and seen somethings that he sent me to while I was solo. All things you wouldn't see if you didn't get in touch with him.
The great thing about dealing with byways is he's been on all these roads before. He's not going to tell you this is good for an adventure bike with your kit when most would be dropping you know what in their pants if they were on a trials bike.
The other great thing about byways is his wide ranging interest and curiosity. So he knows where those hidden gems are that most people just drive past.
What's a few shekels when it come down to having a really enjoyable ride without missing something you'd be kicking yourself over when you figured out you missed it. It will also save you a bunch of time and effort.