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Incorrect.
Witches adding spells are a sidebar. (APG 68)
Magus Black Blades are a sidebar. (UM 48)
Optional rules are labeled as such - such as the Gunslinger's Daring Acts (UC 12).
Eastern Weapon Equivalents (UC 134) are not listed as optional rules. They are part of the section on Eastern Weapons, which runs starting on page 131 (labeled such in the race guide for easy look-up, not because you can only use weapons on page 131).
The daikyu is an eastern weapon, therefore it is usable by the exotic weapon tengu trait, which states that the Tengu can be proficient in Eastern weapons. It is equivalent to a longbow - that means that a character proficient in the daikyu is proficient in using a longbow. If you're proficient in using a longbow you are proficient in using a composite longbow, RAW - so I'm reading it as Daikyu grants composite longbow proficiency. As all of these are legal in PFS, I see no reason this should not be allowed.
I'm not saying how I would rule on this. I've stated my case. Any more would just be repetitive.
I'll leave you with, expect table variance.