Hi Dave G
In SA we have been using velcro centres for several years now, they work well. We also use them at the medium to long distances at the Queens, changing them every few competitors (varies depending on distance) to avoid loosing a clear line on the rings that may compromise a shooters score.
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At 300m/yd we use the red stick on dots instead of the stick based markers. They are easy to see at this distance (haven't come across anyone who has a problem with them yet), can be reused several times before a new one is required, (leave an edge up to make getting off easy) and totally removes the danger of shooting a stick through the target. We have been doing this for a few years now as well, it saves targets, time and frustration for the shooters and markers.
Lynn