So as written, the Spellguard Blade does absolutely nothing for anyone who uses Twin Parry, which means it's weirdly ineffective to anyone with it instead of a standard main-gauche. Should it work with Twin Parry (or any other future feat that does a similar thing)?
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Just to point out that a Spellguard Blade is still a weapon with the parry trait, and it still normally gives you a bonus to AC (in addition to the bonus to saves), so it works with Twin Parry the same as any other main-gauche works with Twin Parry. It's not worse than just using a normal main-gauche. The only question is whether or not you get the +1 to saves, which is probably table variation, though I think you probably should since you are parrying with that weapon.
Because the parry trait of the Spellguard Blade (a +1 striking main-gauche) triggers the additional +1 to the circumstance bonus to AC from Twin Parry, the wielder is, in effect, "benefiting from the +1 circumstance bonus to AC from this weapon's parry trait," thereby meeting the criteria for the bonus to saving throws against spells.