Clever.

My '78 Peugeot 704 sedan came with power windows. It's backup was a geared plastic T-handle you inserted into the space where the regular handle went in the door , which was normally covered by a round plastic insert. It fit to the normal gear the handle did, so you could lower and raise the windows even if there was no power.

I really miss that car, it is still the most comfortable touring car I've ever owned. Still have the weird foot long tubular adapter you needed to pull the spark plugs...