Ward upgrades

Can we please have a ward trinket upgrade to a pink ward(only allowing one at a time like normal pinks)? It's quite annoying when you have enough gold to buy your 6th item and then some, but can't use a pink ward vs a Twitch who is fed out his ass(or a fed Vayne, or anyone else with stealth) if you do, forcing you to NOT buy your last item just to ATTEMPT to survive their surprise boatloads of damage. I can't trust other people to drop them in the middle of a fight, so I do it myself, and it sucks. If I could at least upgrade my trinket(only giving me one ward effectively, but still), this would feel less like I had to limit myself to fight off someone who already has an advantage against our team(being fed and invisible).