Forcing you to drop the radio to look at things was kind of a blunt nudge into trying that that I'm not super happy with, so I'm glad someone tried it!
It worked perfectly. The "annoyance" of having to drop the radio naturally pushes the player into exploring without it... and the consequences thereof.
I tried and managed to get a few different endings! I think I have some idea of how they work, too...
I'm glad it was mentioned here, because even after leaving the radio behind, I didn't think to seriously try using the UI without it :)