Quick switch to vaal skill

[Laope]

I understand how vaal skills work, but recently I was trying to improve vaal gems with Gemcutter's prism and it said I can't 'cause gem is corrupted. That made me think - I've literaly never used vaal version of skill (I am in act 5), because I don't have them binded on hotkeys. I just don't have space for them. Is there a way how to quickly use vaal version of skill once it's charged? E.g. I have Fireball binded on E hotkey and after its vaal version is charged I can trigger it by pressing shift+E (for example... I've actually tried this combination, but it doesn't seem to work).
If there is no way how to do this then it makes more sense to use just regular spells and improve them with Gemcutter's prism a bit rather than painfully re-binding hotkeys in middle of combat.

[Grumpy]

if you are no necromancer and you have no place on the skillbar, its a good sign that you have too much skills in your current build (auras excluding ofc because they dont need to be permanent on the skillbar)

as for the question, no you cant use Shift + something to go around the limit of the skillbar slots.

moreover, in a lot of cases the Vaal version is a kinda good boosted version which is extremely good. and not to forget, you can have 20% vaal skills too.

[Drake]

First rule. Don't use gemcutter prisms to mod gems. Never. Unless it's a looted 19% already. It's a waste of money. Save gemcutters for the recipe.
A lv 20 gem sold with a gemcutter will give you the same gem q20% lv 1 (put spar gems of you main setup in the swap weapons, they level up too, so that you don't get into the situation where you're using a lv1 gem at lv90 without a backup after the recipe).

To make a 20/20% vaal gem, you need to level several gems that way, then use the gemcutter recipe, relevel them and when the gem is lv20/20% you vaal it, if you're lucky you'll get a vaal gem 20/20.

Otherwise just buy looted gems from other people, it will cost less than forcing 20 gemcutters on a gem to upgrade it.