Anchored objects in an interactive pdf created in InDesign

Hi, I am creating an interactive pdf of a price ticket in head office (in InDesign) and sending to 8 stores so the sales staff can create their own price tickets. This part is fairly straightforward, however, we are now looking at changing the styling and the pound sign (£) and the .99p are a smaller font size than the main digits (see screenshot). Is there a way I can create those two elements as anchored objects and paste them into the price field so they will always centre regardless of the price i.e £99.99 or £1299.99? I've attached a screenshot showing what I am trying to do. I can create here using InDesign scripts from a .csv but I don't have the time to create all these and I certainly don't want stores emailing me every two minutes.

Thanks.