Forms don't have to show picks within the gizmo - you can press a button on one pick that opens up a list of picks on the hero - like all the specialties. That's how Shadowrun handles it. And then just build a text list of the specialties for that skill for display on that skill.
That way, the advancements for specialties add them to the hero, like everything else, and then the skills figure out what specialties they've got.
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