AFAIK, the "aftermarket" bits market for 54mm is pretty much nonexistent, as the scale is geared towards painters/collectors more than gamers.
Any reason you couldn't make one, yourself? The geometry of a kite or heater (most appropriate for Templars - which one, exactly, dependent on time frame) shield is pretty simple, as is the design of a Maltese cross - a bit of simple layering of styrene (or cardboard, in a pinch) sheet, perhaps with a bit of gentle curvature, should give you little trouble. In fact, it would likely be more in line with the 40k aesthetic, which generally has raised iconography (to ease painting), as opposed to a 54mm kit meant for display painting, which would likely be flat/
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