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Perhaps there's lore somewhere that refutes this view, but I find myself doubting the "find a soulstone" angle to begin with.
From what we know (and / or guess) about Soulstones, they are basically contained knowledge and memories, not actual aptitude for something. If they contained the actual ability to do a job, then giving a handicapped man a MNK soulstone would give him the ability to do kung-fu and backflips, and giving the Gem of Shattoto to the aetherless Thaumaturge brother would make him the world's most powerful wizard. With the boxes and boxes of PLD soulstones that Ul'dah apparently has, they could hand a stone out to every man, woman, and child, and have the most powerful military on the continent. Additionally, before you're given any of these Soulstones in the first place, you're already accomplished in the foundations of what makes those jobs possible, to the point of maybe even being the best at it in certain cases.
Finding a WHM soulstone seems like it might give you the knowledge to control Succor, but I highly doubt that it would give you the succor itself, considering we apparently have evidence that suggests that Succor was given, and not created. If this is indeed the case, then it wouldn't be possible to gain control of Succor simply by gaining a Soulstone, you would still have to go to the source.
If I had to guess, the "nefarious second way" that someone quoted one of the devs as saying would be something along the lines of "finding a Padjal or Elemental and kicking the Succor out of them," since that still involves getting Succor from the source material in some way.
From what we know (and / or guess) about Soulstones, they are basically contained knowledge and memories, not actual aptitude for something. If they contained the actual ability to do a job, then giving a handicapped man a MNK soulstone would give him the ability to do kung-fu and backflips, and giving the Gem of Shattoto to the aetherless Thaumaturge brother would make him the world's most powerful wizard. With the boxes and boxes of PLD soulstones that Ul'dah apparently has, they could hand a stone out to every man, woman, and child, and have the most powerful military on the continent. Additionally, before you're given any of these Soulstones in the first place, you're already accomplished in the foundations of what makes those jobs possible, to the point of maybe even being the best at it in certain cases.
Finding a WHM soulstone seems like it might give you the knowledge to control Succor, but I highly doubt that it would give you the succor itself, considering we apparently have evidence that suggests that Succor was given, and not created. If this is indeed the case, then it wouldn't be possible to gain control of Succor simply by gaining a Soulstone, you would still have to go to the source.
If I had to guess, the "nefarious second way" that someone quoted one of the devs as saying would be something along the lines of "finding a Padjal or Elemental and kicking the Succor out of them," since that still involves getting Succor from the source material in some way.