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There's a few that have discarded the heel, as it is a bolt on arrangement for the Touring and Custom. Does the Flying Fortress not have holes where the heel could just be bolted on the existing lever?
It's a bolt-on Moto Guzzi accessory (or supplied with the bike new), as far as I know, for all that series. The part number is/was B063751 for the Cali 1400 Touring. They may have changed this for the latest bikes.
Looks to me like the floorboard models are one way w/heel/toe and footpeg models are the other. Could you find someone w/a Custom or Eldo model close by to compare? Then you could maybe swap to see if all clears the frame and peg plus works for your foot.