The Profiles have the option of being Self-Serve. You could assign an updated version of the Package containing the APK to the devices and then set it to Self-Serve so that users could navigate to the MobiControl agent and manually trigger the install to occur when ready. You could create an SOP of sending them some sort of repeated message to remind them to do this for a few days and then eventually set the profile to Automatic if you want to force it to install after a given period of time.