I implemented the design and I'm happy to report it works great! Thank you to all that helped with review/comments and special thanks to @msgreenf for a great job with all the programming and @chopedogg88for excellent service providing the C4 parts I needed. I highly recommend both of them any time you need assistance. This was my first experience with remote support and I'll do it again without hesitation.
The responsiveness of the Z2IO-based solution is incredibly different than the MyQ integration solution plus I really like the C4 "garage door" experience button. Although I allowed for their future addition, I chose not to add a second contact sensor to indicate "fully open" at this time - just one contact sensor for now. Here are some photos I took to document the install:
Cat5 installed for the garage door obstruction sensors I used to piggy back the contact sensor
Selecting the location of the contact sensor
Installing the contact sensor - they don't come with installation instructions and it took me a bit to figure it out!!
Wiring the LiftMaster Security+ adapter and ready for Z2IO install
Z2IO install showing wiring hook-ups plus final install pic - looks a little busy, but it's on the ceiling above the motor and the items are small so you really don't see it. The additional item plugged into the surge protector is a LiftMaster Security+ repeater for an older car - it is not part of the C4-garage door integration solution.
I'd be happy to answer any questions if you would have, but I'll need Mitch's help with any Composer-related questions!
I bought a driver written by @Bogdy. Everything worked great, I could see that the generic Control4 motion driver was sensing motion and temperature just fine. However, I had an issue getting any programming to read the motion and trigger any events. I reached out to @Bogdy and he quickly set up some time to troubleshoot. Turns out it was a simple reboot of my controller that fixed the problem. Awesome support and awesome driver.
https://www.unilogiq.com/en/control4-drivers