Can you obtain a Transmuter’s Stone if you “morph” into a Transmuter statblock?

Volo’s Guide to Monsters contains a Transmuter statblock, a humanoid of CR 5 with the following trait :

Transmuter’s Stone. The transmuter carries a magic stone it crafted that grants its bearer one of the following effects : Darkvision out of a range of 60 feet, An extra 10 feet of speed while the bearer is unencumbered, Proficiency with Constitution saving throws, Resistance to acid, cold, fire, lightning or thunder damage (transmuter’s choice whenever the transmuter chooses this benefit). If the transmuter has the stone and casts a transmutation spell of 1st level or higher, it can change the effect of the stone.

It is, I believe, possible for a high level caster to “morph” into a Transmuter statblock, either by True Polymorping into it directly, True Polymorphing into a creature that can then Change Shape into it (such as an Ancient Metallic Dragon), or Shapechanging into it.

My question is : if you “morph” into a Transmuter statblock, do you gain access to its Transmuter’s Stone ?

Do Artificers, Archivists, and similar classes have any way to exploit the transmuter’s Spell Versatility?

From Unearthed Arcana, specialist transmuters can gain the following:

Spell Versatility (Ex)

A 5th-level transmuter using this variant can adapt magic of other schools to his own style of spellcasting. For every five class levels that the transmuter gains, he can select one spell of any spell level that he has access to and treat it as if it were a transmutation spell. This means, for example, that the specialist can learn the spell normally and even prepare it as a bonus spell from the transmutation school. This spell can even be from a school that he has chosen as a prohibited school. Once a spell is chosen to be affected by this ability, it cannot be changed.

The example text describes this as a convenient way for a transmuter to obtain spells from schools that they have prohibited and I have little doubt that it’s handy for giving spells some boosts from whatever bonuses to transmutation that you happen to have. However, does this ability have any use for classes that are not Wizards, but can obtain their spells? For example, I struggle to imagine that there’s not some sort of Artificer, Archivists, Spell-to-Power Erudite, or even Advanced Learning exploit for this. Are their any tricks this can lead to this ability giving a class that really shouldn’t have a certain spell access to said spell?

Note: Although it may be relevant and answers related to it would be accepted, this isn’t intended as a question about multi-classing. My interest is mostly in what the optimization consequences of say, having a non-enchantment version of Charm Person existing or being able to make or access such a modified spell in scroll form.