I used the iPhone configurator to accomplish this (or the macOS server configuration tool). It's been a while since I've used it but I seem to recall it being quite easy.
OK, so using the Apple Configurator, as suggested above, I was able to create 2 new homepage icons, one of which loads Indigo without the status bar, and one of which keeps the status bar so that I can reach the rest of the app-- logs, devices, etc. And the state seems to hold either way, so even if I go back and press the main Indigo app icon, it'll stay in the mode that it was last launched in. This is pretty cool.
But using those does pop up the little Safari warning "open in Indigo Touch?" dialog box, so I don't think those will be my main ways to access the program-- they are just a handy way to toggle back and forth between the full app and the kiosk version as needed.
Which brings me to my next question. As a final trick, what I'd really like to do is change the icon on the main application (the one I will mainly use). It seems like there are possibly 2 ways to do this:
1) Change the PNG file in the directory of the app. I thought I could do this with something like iExplorer, but it seems that somewhere back around iOS 8 Apple has made these directories inaccessible to the file explorer programs. Does anyone know of a way to do this? I actually have xcode installed, from back when I thought I might get into working on apps, though I have never done anything with it. I would assume that it's not as simple as importing the compiled/published app into xcode and messing around with it.
2) Is it possible that there is a way to do this via the Configurator? Is there a file address on the iOS device that doesn't route through Safari (and thus would avoid that pop up box asking if I want to open in Indigo Touch)? If so, I could just use that that address.
I realize this is an absurd level of customization, but isn't that what HA is all about?
Thanks for any ideas.
p.s., I have no idea why this thread isn't showing up in the "active topics" section of the forum. Hopefully at least some users are seeing while it is in the "new posts" section.