Here is something I've been playing around with. The forked arms are contained with MR6702-ZZ (15 x 21 x 4 mm) Ball Bearing which will mate with a solid aluminum plug on either the shoulder or the hub fixtures. I'm still playing around with the configuration for the aluminum plug, I'm not sure if the first photo with shoulders step for the Bearings race might perform better than just straight aluminum plug which is press-fit into the shoulder. My goal is reduced weight, zero play and to reduce the width of the shoulder joint so that it doesn't interfere with my carbon corner supports.
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aluminum plug
New fork arm
aluminum plug
New fork arm