I can only speak to Z-Stuff issues. After my initial communication, which required both email and phone calls, I had no success in contacted them by any means - even snail mail. Dennis was in the process of retiring and his daughter had taken over order processing but Dennis continued to handle the tech end, admitting vocally that he wasn't happy doing so.
After any number of unreturned emails, calls and letters, I gave up. I'm sorry you're having the same type of experience but you're not alone. I would look elsewhere for your signaling solutions. I'm a fan of Atlas O because they use the prototype "shunt" to detect track occupancy. Atlas adopted, then absorbed Custom Signals. Custom would do all kinds of "custom" work but that was before I discovered them. In recent months, I have seen ads for a new "Interlock Control Module" that will do all the fancy stuff at a reasonable price that I had been trying to "reverse engineer", using the original system boards.
Eric of Eric's Trains did a nice pair of tutorials featuring the original Atlas O equipment:
https://www.youtube.com/watch?v=Y31p1AiPaWA
https://www.youtube.com/watch?...WymTNBHo&t=3156s
As for signal bridges, Atlas has them in other gauges but O requires more ingenuity, as usual. In your position, I'd use the Z-Stuff signal bridge and then adapt/modify the Atlas signal heads to suit. Atlas isn't cheap but the best never is. With Atlas you really get into the "meat 'n' potatoes" of prototype signaling and what could be more fun or challenging?