This sounds ideal for the set up and financing of "Phyles" ,
http://www.dailymail.co.uk/news/article-2100565/Spanish-village-goes-peseta-euro-crisis-takes-hold.html"Spanish village goes back to peseta: Residents turn to old money they'd held on to"- Thirty businesses have started using old currency - Spain estimated to have saved 1.7bn euros in pesetas
"unlike other eurozone countries, pesetas can still be exchanged for euros at the Bank of Spain in Madrid where a deadline for turning in old money was never set."
note : Thanks to Topi for suggesting the article