You may want to look at the scripting on the monk Kensai ability:
c5CMnkPotK aka "Path of the Kensei"
There is a script on there that calls the skill/tool proficiency configurable (meaning it opens a Proficiency tab) and somewhere in script indexed as #3 there are a couple of AllowTool2.xxx tags assigned to the configurable to narrow down the tools selection. If the tools are already proficient, I don't think they show up as available on the configurable tab.
This is an odd way to do it, but the only example of code I have seen for tool choices that works well.
Tool proficiencies are handled completely different from skill proficiencies, and are harder to deal with IMHO.
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