Adria replacement window after break-in

Hi, unfortunately our 2020 Adria Adora Isonzo was broken into, even though stored in an indoor barn location, through multiple padlocked gates/doors. My brothers motor home and caravan were similarly affected.

Luckily, nothing was stolen, as being in February, the van was virtually empty (certainly nothing of value), but inside was ransacked. The biggest problem is a side window was smashed. Adria dealers are quoting 12-16 weeks minimum for a replacement. Eeco are UK-based replacement window manufacturers but this window is too new for their moulds (!) so they cannot help.

We are now reluctant to place the caravan back in its undercover storage, which is isolated, in case they return having identified the location as a small storage unit.

In the short term, I’ve masked the window with thick polythene, but clearly I need a permanent fix.
Anyone any other ideas? Other manufacturers? Caravan scrap yards?

thanks