Recommended method to use Ubuntu Frame on a custom Core image?

I have a snap based kiosk app that I’ve used to make an custom Ubuntu core image. I included Ubuntu frame as a snap in the image model assertion to make installation as simple as possible. When I flashed the image onto a device and booted for the first time, it successfully booted and loaded directly into my kiosk app’s GUI. This is great and (partially) what I expected to happen. The issue is that Ubuntu Frame interrupts the initial setup of core. In order for my app to work properly, the network needs to be configured in a certain way, and that’s not possible with the current setup. On a similar note, it’s not possible to SSH into the device’s terminal. Is there a known way around this issue? Or is the only solution to not include Ubuntu frame as an image snap and, after the initial boot and setup, install it?