Does the interpolated version when you re-interpolate in a Brace layer take the custom InterpolationWeightY parameter of instances in consideration?
Pfff… have you tried?
And the reverse question is…
If there is a custom InterpolationWeightY in an instance, and a brace layer for this instance’s weight in a glyph, when the other instances are interpolated does Glyphs take this into consideration?
Wait a minute. Logically not possible. Because imagine a setup where you have two instances with different InterpolationWeightY values, but otherwise the same.
Edit: should be relatively easy to script, like Insert Instance as Brace Layer.