InterpolationWeightY but for masters?

Hi, I’m looking to re-interpolate my masters. Similar to adding the InterpolationWeightY parameter to an instance, what’s the best approach to interpolating a master anisotropically, while retaining all editing capabilities? Exporting as an instance and then re-importing is an extremely messy workaround. Basically, I would like to use the RMX Scaler but with separate axes. Specific case: I’m doing a customisation of a typeface and want to lower the contrast in the masters (first roughly, synthetically like this and then of course work on it by hand). Any ideas? Thanks!

Edit: Never mind, I should have spent one more minute researching here. Clicking “instance as Master” on the instance with the InterpolationWeightY parameter applied adds the correctly interpolated master. Cool. Sorry to bother.