How to make Vaal gems more usefull and corrupted Areas more rewarding

Vaal gems are a great idea but at the moment they do not really fit into the limited numbers of sockets. And a other problem is that Corrupted Zones are not really rewarding, because after some you have all the Vaal gems. There is not enough variety in Vaal gems.

So to make it more fun GGG should implement a new Gear Slot. In this Gear Slot you can put in one Vaal gem, could look like this



To use the Vaal gem in this slot you need to have a non-Vaal Gem version of this Vaal-Gem somewhere else on your gear. And to make the Vaal Gem more interesting and Corrupted Areas more intersting Vaal gems should get Mods. The mods could be stuff like "Vaal Gem is Supported by lvl XX support gem XXXXX", "Needs 20% less Souls", "First Use in a new Instance only need 50% of the Souls", "Magic Monsters give two Souls" etc.
Corrupted Areas would become alot more interesting because you cant change Corrupted Vaal Gems in any way, the only way to get the Vaal gem you want is to do Corrupted Areas or trade. And every Build could have and use one Ultra Spell, which is just more fun :)