I assume the issue is it failing the deeper play integrity check which is about it not being "Google approved."
It's normal to have root (or Administrator) on your devices. After all, they are yours. They don't belong to the device manufacturer. You should have full access to your own devices by default.
Only recently did we somehow normalize the idea that the user should not be the ultimate decider over their own devices.
Edit to clarify: I don't say I agree with that, I believe that if they don't want you messing around inside their app, then they shouldn't ask to be on your device.
I propose you buy enough ingredients from the supermarket and make a big batch.
The scientific test is: how far do you get, before your door is kicked in?
If that fails, then science #2: have fun lighting it!!
You almost win both ways. (although I admit I wouldn't fund you even via a trustworthy intermediary say a Kickstarter campaign.
On a side note, if you want to be extremely specific, the line between the physical and digital threat does not exist anymore. There are two things people need to be afraid of: incompetent friends and competent enemies. Tech giants are already filled to the brim with incompetent friends, which drastically lowers the bar for the competence of their enemies.