[Chaos]

Realistically, this would be impossible to pull in a real combat anyway due to how lengthy this is....

Realistically, an Evoker has plenty of time and security to pull at least one of these off (HSDW + Invocation Talent + anything granting Silence immunity, add in practically any source of defense boosting or attack redirection in team fights, etc.), and what you're suggesting would make these spells absolutely absurd. For example, momentum cost for casting just one of these spells is actually:
1. 13 Momentum (HSDW -> Casting) [2 Rounds]
2. 19 Momentum (CM -> HSDW -> Casting) [3 Rounds]

Nowhere near the investment costs needed to justify making these spells ignore prime defenses against Evoker spells. This goes doubly when they already have at least one solid effect each.

'Doomsday countdown' would be A-Rank, which I believe Kameron made a suggestion thread on some time ago.