You know that stiff pink insulation? I used titebond II glue to make edges for it. Then used the titebond II glue to put on fabric of my choosing to cover it. That was for covering the solar panel on my reverse LG TD - perxactly in the position of that front window!!
Now I had that held on with straps and buckles and you can't do that.... BUT, those industrial plastic to plastic outdoor Command strips were not available. It's a way to match your camper's color and style and you can take it off when you park. The key would be to have the edges pushed down tight.
It was just an idea and you'd have those strips visible when you took the cover off. Would there be an Earth magnet option where you could color the magnetic strips? Could you put strap holders at the top and bottom of the window (where would they come out inside? and they'd have to be reinforced inside). Strap holders would be much more inconspicuous and not distract from the T@B look. BTW, strap ends need to be tied down - tip for those who've never traveled with tie-downs.
I use this thermometer for my fridge. It is left over from my motorhome. It has two temperature senders, one for the fridge, one for the freezer. Well, my Norcold 180 does not have a freezer, so now sensor #2 goes outside for the outside air temp. I probably bought it on Amazon, but I am sure there are more like it elsewhere. You can see that the remote sensor says #2, #1 is in the fridge, which is off. Also see it records max and min temps.
I wired mine to the running lights. I just turn on the lights and my Garmin camera mounted above the T@Bs license plate pops up on the GPS screen. No need for a switch.