I can't see the pic but will when back home or in pub this evening. Thanks.

I have become so used to the idea of top mounted big old aircons that it too me a wee bit for my lateral thinking to kick in. Something like this size vented out the passenger window would get the job done.
https://a.aliexpress.com/_EGC4sqm
Just a shame that at this size it's still compressor driven. The first inverter type I found was a Bosch 5000btu unit.