Topband: Plexiglas Coax Feed through

[allan1 dejazzd.com]

I am trying to bring the coax for my EWE through my window. Does anyone know where to get the Plexiglas expandable pane (to put in windows) which has the coax feed through (double female UHF connectors) mounted on them?
Radio Works no longer stocks them and MFJ's is simply laminated wood which my wife doesn't like.
If someone has another idea without cutting or drilling hole at the base of the window frame, it would be greatly appreciated
Thanks
Allan W2TN