This is the poignant section for the buckler:
You can also use your shield arm to wield a weapon (whether you are using an offhand weapon or using your off hand to help wield a two-handed weapon), but you take a –1 penalty on attack rolls while doing so. This penalty stacks with those that may apply for fighting with your off hand and for fighting with two weapons. In any case, if you use a weapon in your off hand, you lose the buckler’s Armor Class bonus until your next turn.
I'm looking into methods of using a buckler without losing its Armor Class bonus when dual-wielding. I am uncertain if my method works, therefore I'm here to collect a second opinion. Below are my questions:
1) A character is wielding a weapon in both hands and has a buckler equipped. If the character does not use the weapon held by the same limb as the buckler, do they still receive the buckler's attack penalty?
2) If a character uses something such as a Kobold Tail Attachment or a Dwarven Boulder Helm to make their off-hand attacks, is the buckler's Armor Class bonus lost?