• Reckon it’ll be okay?

    Yes, it will be fine. DH bikes had 1" steerers in the olden days, as did the majority of tandems. At this point, I usually mention the skinny steel tubes which were good enough for Nelson Vails on his own, but by way of a change, here's a 1" steerer supporting both Vails and his tandem stoker (Leslie Barczewski?)

  • I’m not really worried about the steerer, just looks pretty tiny after riding with a tapered head tube.

    I was asking more about using a shim on a carbon steerer.

  • I was asking more about using a shim on a carbon steerer

    That's fine; if you want to play safe:
    1.Make sure you thoroughly deburr and chamfer all the edges which contact the steerer
    2.Use a shim that's slightly taller than the stem with some 1⅛" spacers covering the projecting ends
    3.Use a turned and milled shim in preference to a stamped and rolled one

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