The Singular Panini, A Fact of Life

We pedants - here in England, at least - long ago gave up on 'panino' as the singular form of panini. Correct it may be - but what kind of a prat would actually ask for a panino? And the singular panini, it seems, is good enough for the French... So, we've had to grit our teeth and get used to the catechrestic plural 'paninis' (or, of course, 'panini's') all over the place. However, the domestication of the panino has now taken another step - the other day, I saw a café fascia proudly advertising 'paninies'. Will the panino go all the way to 'paniny'?