HOI interpolation on alternate layers?

I am trying to create this type of animation that re-creates the ductus of a letter (using HOI). So far I found that there is more control on simple curve segments; as soon as there is more than 2 on-curve points, it gets funky. Also, to reproduce this thing of one stroke at the time, I thought that using alternate layers would save me from multiple animation axes etc. But after decomposing all my segments in between alternate layers, I find out that HOI can’t be edited in them.

I am experimenting, and I don’t know what would be the best approach so… I would take any recommendations. Anyway, a vid will be more explanatory: https://drive.google.com/file/d/1pBGuLpXN0EbkstRYgHnU5sQQ0GpGR3TN/view?usp=sharing

The first glyph has HOI, the second would like to have it.

Here is the test file:

test_HOI.glyphspackage.zip (7.3 KB)

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