initIface* usage in plugins

[Josh Meredith]

Hi,
I'm trying to use initIfaceLoad and initIfaceLcl to lookup core `Name`s
within a plugin. My understanding is that functions such as
`lookupIfaceTop` are used for this, but I'm running into an issue that I
suspect is caused by some `Name`s being inappropriate for this function, so
they fail with the error `Iface id out of scope: ...`.

Is there a robust way to select which `Name` lookup function to use based
on a core binding/expression?

Thanks,
Josh
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