Nah, by raw it clearly falls under this:
Spoiler: PHB175
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V a r i a n t : S k i l l s w i t h D i f f e r e n t A b i l i t i e s
Normally, your proficiency in a skill applies only to a
specific kind of ability check. Proficiency in Athletics,
for example, usually applies to Strength checks. In som e
situations, though, your proficiency might reasonably
apply to a different kind of check. In such cases, the DM
might ask for a check using an unusual com bination of
ability and skill, or you might ask your DM if you can
apply a proficiency to a different check. For example,
if you have to swim from an offshore island to the
mainland, your DM might call for a Constitution check
to see if you have the stamina to make it that far. In this
case, your DM might allow you to apply your proficiency
in Athletics and ask for a Constitution (Athletics) check.
S o if you’re proficient in Athletics, you apply your
proficiency bonus to the Constitution check just as you
would normally do for a Strength (Athletics) check.
Similarly, when your half-orc barbarian uses a display
of raw strength to intimidate an enemy, your DM might
ask for a Strength (Intimidation) check, even though
Intimidation is normally associated with Charisma.
The "action economy" could be covered within RAW too:
Spoiler: same page
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Pa s s iv e C h e c k s
A passive check is a special kind of ability check that
doesn’t involve any die rolls. Such a check can represent
the average result for a task done repeatedly, such as
searching for secret doors over and over again, or can
be used when the DM wants to secretly determine
whether the characters succeed at som ething without
rolling dice, such as noticing a hidden monster.
Here’s how to determine a character’s total for a
passive check:
10 + all modifiers that normally apply to the check
If the character has advantage on the check, add 5. For
disadvantage, subtract 5. The game refers to a passive
check total as a score.
For example, if a 1st-level character has a W isdom of
15 and proficiency in Perception, he or she has a passive
W isdom (Perception) score of 14.
The rules on hiding in the “Dexterity” section below
rely on passive checks, as do the exploration rules
in chapter 8.
5th is a lot more flexible than older versions. it doesn't need a specific way to do it because there are lots of reasonably ways to identify a spell being cast.