Have an option to make starting builds automatically buy items for us?

Basically what it says, when we premake builds, have an option to have these items automatically bought for us when we enter the rift using that particular champ.

Maybe even have a special button on the shop? Of course the option to refund the build would be available if you want to go for a different set or tweak it.

(also I forget to buy trinket sometimes and feel like an idiot)

Edit: This would only be for your starting items.