I would like a crit chance mastery or new runes perhap or another item without attackspeed that gives at least 15% crit chance but less crit damage like -20%.
Crit runes could all give like % bonus base ad but convert to crit chance if a minimum of 20% is reached. You could choose from either plain crit runes or crit runes that give you twice as much crit chance but at the cost of less crit damage.
I'd change sheen, have it no longer scale off base ad, rather give it a fixed value that's about the mean of all champion base ad.
I'd do a similar thing for all total ad scaling champion spells such that they only scale off total ad but still gain damage per level and scale off bonus ad only.
Now I would give triforce maybe less cooldown maybe 10% less attackspeed and like -50 mana and you'd have room to give it like 25% bonus base ad.
Might even give sheen a slightly smaller value something close to 185% base ad on sheen procs to allow for say 30% bonus base ad.
Bonus base ad is cool because it enhances auto attacks like crit but with less scaling and is not counted as on hit. It's great for AA bruisers who aren't that interested in stacking ad. It can also work for carries as it synergies with crit.