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1. Yes.2. Yes.Both are special initiative cases, so you can negate or interrupt the ability that is causing special initiative.
Invoking was ruled that u have to ITB or use a Negate last against it.
Wrong. During special initiative, it's still in play.
Q11) How do Negates work in regards to cost/benefit abilities that include removing the targeting card while granting special initiative?A11) This question is currently under some debate. However, the current official rule is that you can't target Artifacts ala Unholy Writ with any negate card after use. That you can use an Interrupt the Battle/Negate Last to target an enhancement not in battle, and that you cannot use a general negate for the same purpose.
Actually for the questions I asked, no you haven't.