What functionality is it missing?
I'm currently doing it with no problems (this method is actually reverse of what you've done, but i don't think it'd make much difference?)
I have my option set to use legacy postbit to no. Then I have 2 skins. The first skin makes use of the "postbit" template.
The second skin (child skin of first) has the "postbit_legacy" template copied over the "postbit" template and everything works fine for both skins.
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