you can hookup the panasonic unit to a window manifold for a portable AC and put some insulation board over that. that is the only reasonable solution I have found for the states
I've had good success adding various utility and ventilation feed throughs in rentals with sliding glass door inserts, including large ducts for various HVAC experiments.
I start with a board and cut/slot it so it fits neatly into the top and bottom tracks, then I move the latch receiver to the board, zip a few screws through the board where the holes won't be noticed.
The glass door opening becomes a bit narrower, and I can cut as many holes as I want in that little bit of wall.
If it's painted white it usually ends up looking better than most of the corporate maintenance work on the building.
I start with a board and cut/slot it so it fits neatly into the top and bottom tracks, then I move the latch receiver to the board, zip a few screws through the board where the holes won't be noticed.
The glass door opening becomes a bit narrower, and I can cut as many holes as I want in that little bit of wall.
If it's painted white it usually ends up looking better than most of the corporate maintenance work on the building.