Question - Command to click a specific item?

[Myysterio]

Is there a /useitem command to click an item by name, regardless of where it is in the bags?

 

[Sic]

Is there a /useitem command to click an item by name, regardless of where it is in the bags?

yup, exactly what you posted.
/useitem itemname
or /useitem "itemname"

https://www.redguides.com/docs/projects/everquest/commands/cmd-useitem/

/useitem "some item" (or partial name) or without the quotes... this one works for items in keyrings as well (illusions, mounts)