If your not using the cradle, you could probably remove it and fix the CarPlay unit to it, maybe using the rear part of the cradle it a fabricated block to match the four RAM-style plate holes.
Note, of course, it doesn’t replace your actual phone, merely providing a CarPlay interface to it. But a hiccup seems to be that while it can pair with a helmet headset, only the speaker functionality operates, not the microphone.