The cutout for a Carling switch is less than 1", so theoretically you could have a 1.5 DIN panel that holds switches sideways and a 1-DIN radio. I just checked Etsy and nobody seems to be selling them. It would also be great if somebody was printing a 1.5-1DIN adapter plate that angled the radio face upwards. Since my Kenwood offers bluetooth remote control, if I have the tablet in, I'll use that as the radio display. How are you supposed to search Gigs of folders on a tiny screen in front of your knee with little chicklet buttons? Probably safer to find it on Spotify on your phone while driving.
Really what I want is a miniature head unit that goes in the HVAC control or vent location so you can actually see the thing. Now that we don't have CD drives in them, they can be made almost any size, but I don't see narrow ones available. You can get a marine head unit that is a 3" diameter gauge form factor.
If you can relocate the radio, you can put switches in it's old place:
https://www.etsy.com/listing/1019860806/gm-15-din-switch-panel