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You can select all the text in a given style using the Canvas:Selection Inspector, filtering on font only. Once that's done, you cange change the style for all that text at once. Select all the canvases in the document first and it works document-wide.

If you'll have enough styles and you're going to be working on the document long enough to make it worthwhile, you could set up a Styles canvas. Put a text object there in each style whose text is the name of the style to aid selection of a named style throughout the document.

That's not a complete solution because you still have the additional step of changing the style in the Styles pull-down. It also works only within a single document. Did your mention of templates mean that you want to simultaneously change styles in many documents?