Large Bastard Sword and Opalescent White Pyramid Ioun Stone

[NickSullivan]

The Opalescent White Pyramid Ioun Stone says:

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Each stone of this type is keyed to a particular kind of weapon (heavy flail, light crossbow, short sword, and so on) and grants you proficiency with that weapon.

Cracked: The stone grants the wearer weapon familiarity with the keyed weapon (it is treated as a martial weapon for him).

The bastard sword is an exotic weapon that says:

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A bastard sword is about 4 feet in length, making it too large to use in one hand without special training; thus, it is an exotic weapon. A character can use a bastard sword two-handed as a martial weapon.

And finally, the rules about weapon sizes say:

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Inappropriately Sized Weapons: A creature can't make optimum use of a weapon that isn't properly sized for it. A cumulative –2 penalty applies on attack rolls for each size category of difference between the size of its intended wielder and the size of its actual wielder. If the creature isn't proficient with the weapon, a –4 nonproficiency penalty also applies.

Here's the question: Can my fighter use the cracked Ioun stone to wield a large bastard sword? I believe RAW say the stone would turn a medium bastard sword from a one-handed exotic weapon into a one-handed martial weapon for me, which would let me apply the rules about using an oversized one-handed weapon as two-handed with the -2 penalty. This is similar to how the iconic barbarian uses a large bastard sword, but I intend to do it with the Ioun stone rather than the feat Exotic Weapon Proficiency.

I am aware of the following FAQ entry:

Spoiler:

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If a weapon is wielded two-handed as a martial weapon and one-handed with an exotic weapon proficiency, can I wield it one-handed without the exotic proficiency at a –4 penalty?

No.

Note that normally you can't wield a two-handed weapon in one hand. A bastard sword is an exception to that rule that you can't wield a two-handed weapon in two hands, but you must have special training to use the bastard sword this way. Without that special training, wielding a bastard sword one-handed is as impossible as wielding a greatsword one-handed. (The same goes for other weapons with this one-handed exotic exception, such as the dwarven waraxe.)

But I believe that this doesn't apply here, since the Ioun stone makes the weapon martial, and my class makes me proficient with all martial weapons.

[Ralf]

Ralf agrees. The sword goes from 1 handed exotic to 1 handed martial. making a 1 handed weapon large makes it a 2 handed weapon.

[LazarX]

The only difference that a cracked ioun stone would make in this case would be if the fighter did not possess the EWP Bastard Sword feat. For the purpose of wielding this blade the sword would effectively grant you the feat.

If the Fighter does have the feat the stone would have no effect. In either case you would still suffer the inappropriate size penalty the way Amiri does, and like her, you must use two hands in wielding the sword at all times. There is no way to get around this at your standard Medium size.

[Bob of Westgate]

As long as you are proficient in the weapon, whether it's because you spent a feat, or have an ioun stone, you would only suffer the -2 for oversized, but not the -4 for nonproficient