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This is what I got working.
...snip..
I don't have a multicycle_path handy, but I guess (almost sure) that tying the 'attribute' to the 'architecture' and the double quotes to embed the sdc command into the attribute string is what makes it work.
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Just had a thought, but in your code you tie the attribute to a port that would already exist. In the OPs code technically the entities havent been instantiated yet, so their names may not exist in the name table yet (or whatever altera does with them). Im not entirely sure this is the case, because SDC constraints arent usually applied until fitter or timing stages. But have you tried putting the constraints inside the entities rather than the architecture above?
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