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If you're shortening it at the lever end, you'll definitely need the bleed kit. You'll also need the adaptor to connect the fluid cup that fits onto the lever (Shimano part # Y0C698050 or equivalent) if one didn't come with your brake kit.
I disagree, shortening at the lever end is easy and often doesn't need bleeding, and at worse just needs a little burp with the cup, any air is right up at the top of the system so easy to get rid of that way.
Thanks and thanks @svenhöek, really useful, exactly what I needed to know.
Will probably get a bleed kit too, will want to service it eventually.