Not to mention that I'm not a big fan of character option tinkering. If I know
fireball I know
fireball and having to decide every morning if I want to know
fireball or not is...micro-manage-y to me.
I think in most cases, "utility caster" is a very broad concept, so I'd recommend getting more specific about which spells those are and why they are necessary for the theme. Like, if
Comprehend Languages is the only possible way to realize your...magical....linguist...(D&D has had weirder options, sure), that can make sense. But if you want it because the archetype you're gunning for is "I am magical Batman!", then I'm going to point you over to the wizard.
If we've got a gap then I'd probably say, let's make a new sorcerous origin that can use Sorcery Points to cast that spell as a class feature at Level Whatever, and maybe gets other stuff that builds on that theme.
Converting Sorcery Points to Spell Slots on the fly still gives sorcerers a noticeable edge in on-the-fly adaptability compared with something like Arcane Recovery. I don't need to rest if I need more spells today, I just need to
make more magic. And if I think I don't need to make more magic, I can spend it doing other things to my One Size Fits All spell list.
That's not the only theme you can have with the current sorc. In fact, it's not even a theme I've seen anyone play.
IMXP, there is no character in 5e that is pigeonholed into combat, and this is true of the sorcerer as much as other classes.
The
closest is probably our party's OTHER sorcerer, the Dragon Sorcerer, and most of his spells are firebooms, but he's also the party "sage," and focusing on his draconic theme has made him capable of fear and flight as well.
Meanwhile, I'm a halfway-decent scout (well, stats-wise, anyway...character-wise, I'm a crazy gnome, so leaving me alone in a dark tunnel might not be the best idea), and with the highest CHA in the party, I can Intimidate
anyone. (I chose not to be the charming type...

).
Those abilities might be nice to have for a magical thief, but they
are not prerequisites, and so lacking them doesn't make you a sub-par or incompetent magical thief.
Mage Hand,
Dancing Lights,
Charm Person,
Disguise Self,
Expeditious Retreat,
Feather Fall,
Fog Cloud,
Jump,
Silent Image, and
Sleep all compete for the attention of any magical thief worth their tool proficiency.
More broadly, here's the first question I'd ask a player who came to me wanting to play a magical thief sorcerer:
what is the magical origin that gave you magical powers of thievery? Dragon magic doesn't seem inherently thief-y (the most stealthy breed of dragon spits acid and corrupts swamps!), and wild magic
certainly isn't that subtle. If being a magical thief isn't really connected to the player's unique magical origin, then flavor-wise, they're a better fit for Arcane Trickster or Wizard, anyway (your spells are like your tools, used methodically and precisely).
If being a magical thief
was linked to their origin (maybe their origin is that they are cursed by the Plane of Shadow? Sounds good enough!), then I'd probably whip up a subclass for 'em. I've no objection to a stealthy shadow-mage kind of character. And I don't think that these abilities would include any of the spells on your list anyway, because while those are surely fine for a magical thief, they aren't necessary by any stretch of the imagination.
But, the playstyle of a thief is also very close to the playstyle of a wizard - methodical, practiced, with precise, explicit, narrow tools.
Basically, the same responses apply here.
1) Those abilities aren't a prerequisite for the archetype. The archetype does OK without them. (Basically any conjuration or evocation spell can help cement the idea of calling on other dimensions; speed-modification and site and teleportation are also useful).
2) If it was relevant to a magical origin, there's probably a subclass in it. That subclass still might not have those spells. If it's not relevant to a magical origin, don't be a sorcerer.
3) The archetpe of a learned scholar of the planes who pierces the very fabric of reality is much closer in my mind to a scholarly wizard than a spontaneous sorcerer, so while there's room, I don't know that it'd be my first choice.