add dynamic prefix to shopify order number

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Is it possible to add a 'dynamic' prefix or suffix to the order number? 


In our particular case, if the order has been placed with 'shipping option 1' selected we would like the order number to display S1-1001, and so if the order was placed with shipping option 3 selected it would display S3-1001....etc


I can see that I can add a set prefix or suffix but for order processing reasons it would be hugely beneficial for us to be able to do this.