An Idea to Help Mages taking Stopwatch into Assasins

Would it be too game breaking if stopwatch were changed so that it doesn't take a slot while it's on cooldown? It's not like it can be active at all and all it does is fill up a slot so mages have to either sacrifice something like boots or a ward. It'd be a lot nicer if it appeared in your items when it activates like the biscuits do. It'd be nicer to go into lane with a ward and have the stopwatch pop in when I place my ward than to forfeit vision just because I'm forced to take a specific rune into Yasuo or Zed and the like. Just an idea, I'm not sure if it'd make stopwatch powerful or if it taking a slot the whole early game is intentional. Having to have lost chapter and stopwatch fill a slot while you're building zhonyas doesn't feel very good.