The illusionist's shadow spells are a good place to look for inspiration, I think. Quasi-real objects and effects have a long history in D&D.I'd second this - reference the illusionist's 14th-lvl ability: Perhaps the character can use their action (or reaction) to mime the use of an object, which allows them to act as though they actually possessed the real item (and could use it as if it were real for all purposes) until the end of their next turn...
Although you might want to limit it to have the "object" unable to directly cause damage or force a person or creature to make a saving throw.
Perhaps anyone affected by the object who might be damaged or forced to make a save can make a save to be unaffected by it.
A College of Mime bard would have to be Snarf's favourite class ever!
Taking a look at your question, everything seems cool! No glaring imbalances noticed.Anything glaringly unbalanced here?
Also the word dumbstruck. Is it OK to use or not? Can replace with speechless if required.
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