Adding a few lines to items would be a great way to spark interest
Lots of people don't know about League lore, I must say 99% of my friends don't (confirmed by a poll I definitly did).
The medium through which you, Riot, reach your players is INGAME, inside the Summoners Rift. Lot's of people ignore your blogposts walking through x champion design or lore.
A good way to reach out would be to add a few lines, like I think there was in the old times, to items. People may find it peculiar and interesting enought to go search deeper.
Dead Man's Plate is a good example of this: "There's only one way you'll get this armor from me..." That's so interesting because, who kills another person for their armor? Never in any movie I've ever seen have I watched someone kill someone else because of their special armor.
So that line raises questions, what is so special about that armor? Is it magical? What abilities does it give? (movement speed lol)
What is the Randuin's Omen?
I doubt a small line would compromise and restrict future lore that much, so don't fear adding a few lines, even if in the future they may cease to be cannon anymore.
Linguists have long pondered how an item can have a name that is a verb, but Cull pays no mind to them. It Cull. It are.
Death was surprised to learn it had a daughter and doubly that she was a cannon.
The sharpest part of the edgiest time.
In some cultures this item is used as a stylish hat.
"Ach Lux, run It's the Luden's" - Echo
Determined to get as far from Aatrox as possible, the portal legally changed it's name in 2016.
Popular fashion statement in Shadow City, crafted from the hide of a spectral cow.
- Unearthed near the marshes of Kaladoun, the Bloodthirster is thought to have belonged to a powerful soulstealer named Frax Van Itt. The wielder of this dangerous weapon is forever bound to the blade and its thirst for the blood of others.
- Only the boldest of men and women dare take the risky trip to the hottest spot in Valoran, in the very center of the Shurima Desert. Those who successfully make the journey may bathe their swords in a magical pool of the purest water known to this world. Any edge dipped into this pool will stay sharper and strike truer than any other sword.
- The living armor protected the greatest troll warrior in the entire realm during the bloodiest and most devastating battles of the Rune Wars. Deep within the dark woods of Crystone the living armor waits to protect its next owner. A word of warning required before seeking out Warmog... it will protect you for a time, but when it grows tired of you, who will protect you from it?
A device used by Noxian torturers, the mask seals itself to the victims face and slowly drills into their eyes, causing tears of blood to ooze from the mask.
The ultimate in hot potato technology.
Rather uncomfortable, but also rather effective.
"Not to be confused with the Casting Wand, Bursting Wand and Conjuring Wand"
"Merely a formality, they actually do that all the time"
"Designed by Professor Ziggs of the Hexplosives Department. Use with caution"
"Has a history of going missing"
"Wizards claim the ever increasing size has a practical reason, but evidence is lacking"
"Logical Fallacy: To be perfect it would need to contain DRAAAAVEN"
"Once you realize that some stones have sight, you will never feel alone or sane again"
smells of a faraway place...
is from Mt. Targon and 
is from Demacia.. I think.
If people were to read in-game, blah blah a scared item from Demacia's fabled armory, on an item that is common amoungst their pool of champions they may become interested in the region, and by extension the champs from said region, and by chance hooked on the lore itself... what do think of this idea?
Kinda has lore to it