There are 2 ways.
The way Ive been setting the default app is by scrilloing to the end of the developer menu (takes a while) and click on "advanced options". There's a way to set the default apps there. I needed to first disable the native messaging app. That has worked for me, but maybe it's not working with your app.
There's a way to use ADB. I think the command is
settings put secure sms_default_application com.verizon.messaging.vzmsgs
(or whatever the package name is)
please let me know if it works.
Im curious if the Cadence version will work on exterior screen
