A few folks recommended getting around this problem by creating a payload-free package that launches the jamfhelper. The command to launch the jamfHelper is pretty straightforward:
There are a few ways to make a payload-free package. You can use Packages.app to create a package that only contains a script (basically what's above), or you can use Rich Trouton's Payload-Free Package Creator app to build it for you with just a few clicks. Regardless of which path you choose, you should end up with an installer pkg that only contains the script above.


(Previews above came from the handy app Suspicious Package.)
To use it, upload it to your distribution point used by your JSS, and configure your imaging configuration to use it. Set it to a low priority number so that it will kick off before other after-reboot packages. And make sure it's set to Install on boot drive after imaging.


Now when you image your Macs using AutoDMG and Casper Imaging, you should get the Casper Imaging splash screen.
Tada! Splash screen. Thanks to the lovely folks in the MacAdmins Slack for the guidance.
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