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Thanks for the feedback. The setup is pretty optimal as it's a steel steerer, a light framebag (probably not much more than 1kg) and it will be used for road riding with occasional gravelish/towpath sections. I'm not so concerned about the fork, rather I'm worried that turning or repeatedly loading/flexing the spacers themselves (or inadvertently ovalising them by clamping a seatpost collar on them) might wear them and/or impair their ability to do their main job of transferring enough load axially onto the conical spacer in the top race of the headset to keep it properly adjusted.
Here's a photo of the current lash-up made from various reflector brackets. The joint between the two pieces might not last, in which case I'll probably replace the longer strut with a metal piece.
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ffm
@chiroshi
Another thought that should re-assure you: any forces created by the bag bouncing on the handlebar are anyway going to be transmitted through the steerer via the stem. By adding a support on a spacer, you are re-directing a small amount of that force closer to the headset bearing and therefore reducing the moment on the fork steerer and the stem.