The local dollar store is offering various materials aimed at decorative or other consumer grade applications - wood, adhesive, paper, plastic film, wire etc.
Some of the wire coatings might be suited to short-term use, in a pinch, if the wire material itself is usable.
Saw 2mm dia AL the other day ( in six colors . . . .), for which twisted pairs could be hipotted to >2500V. Allowing for low temperature index, mechanical fragility and unknown chemical resistance, they have a limited immediate functionality, in a pinch.