Flexifilter: Replace with node field data

I'd like to be able to replace text on a page, with data based on another node's field.

Ultimately, I want to display some currency conversions on a page, which shows some prices: $20.20, $15.00, etc. I have another node which contains some basic currency exchange rates: $1 = 0.60362 GBP.

So I want to filter my prices, and show $20.20 (=£12.19), $15.00 (=£9.05), where the new prices are computed from the filtered price, and the exchange rate in another node's field.

I guess it combines this module with the Computed Field module