What if we could upgrade jungle items?

With maybe a small combinaison fee (let's say 300g but it could be less or more and even different depending on the item)

Warrior+ 575g + 300g= Youmuu + bonus lifesteal against monsters and mana regeneration in jungle (total cost=3500g)

Runeglaive + 600g+ 300g= Lich bane (total cost=3500g)

Cinderhulk + 75g +300g= Sunfire (total cost=3000g)

It's making me sick having to buy both Youmuu and Warrior whereas they almost have the same stats, not being able to upgrade Runeglaive and having to sell it in late game whereas it's a cheap version of Lich bane, same for Cinderhulk.

The only unique jungle item is devourer.