I applied and my SQ/CC checked "yes" to the excess to the mission question... I think the SQ/CC approval is only to show that (1) you're not ineligible because you're under investigation or in trouble, and (2) the mission won't grind to a screeching halt if you leave suddenly (i.e. at least one other person can fly the plane). My wing CC just said he supported my request (he just has a text box to type in). The SQ/CC has been very supportive so far. Status is waiting at BPO.
FWIW, the rumint I've heard is that UPT ADSC waivers must be approved by the SECAF, and AFPC hasn't submitted a set of VSP applications to her for approval yet. But it is expected that she's on board with the "master plan" (if there is such a thing) and when it comes time in a few weeks, she'll sign off on waiving UPT ADSCs to fix the overages and not RIF people without giving them a voluntary option first.