Getting crit three times in a row by Tryn at level 2 is even more annoying but I don't see people trying to get tryn to have the same kind of crit system as Ashe.
But I would be fine with Triforce having
60% attack speed (would have to be this high to justify the 10% loss of crit chance and 8% movement speed)
250 health
200 Mana
30AD
30AP
10% CDR
200% on hit base damge after using an ability (1.5 second cooldown)
Basic attacks grant 20 movement speed for 2 seconds on hit. Minion, monster, and champion kills grant 60 movement speed for 2 seconds. This is halfed for ranged champs
But you do understand thsi would mean that with wit's end gettign above a 2.0 attack speed would be common.
You also do understand that crit chance is only based on the AD a champ has and not the spellblade passive from sheen items meaning that this would actually be a buff for Irelia Damage wise given that 30% attack speed with her true damage and on hit flat healing ammount is better overall especially late game where base attack speed is higher.
That all being said Corki and Ezreal would like to have a word with you about it being a fighter item.