There is a ton of confusion on PF/PF with the GI Bill, and no one knows what the hell they are talking about but I've been down this road. I have it in writing (MyPers Contact, it works well) from several offices that you can't Palace Front with an outstanding GI Bill ADSC. Data points are below, it's BS but this is what I was told, corroborated by multiple people at AFPC:
Even though the document you signed to transfer benefits states that it is a "service commitment", AD Air Force "interprets" it as an ADSC. Everyone else, including the VA sees it as an agreement of any kind of service (even part-time Guard) but mother AF says otherwise. The worst part about this is that it's "a policy" for it to be an ADSC, no regulation specifically prescribes it.
You may have been told (before signing; I was) that you could simply reverse the transfer of benefits and thus revert to the previous ADSC: this is false. Unless you can get it in writing that you were miscounselled by an official, it is irrevocable even if the transferees haven't used any benefits.
This info was given to me and confirmed with the PC and PF offices, the Transfer of Education Benefits Office (TEB), the AFPC Help Line, and (pretty sure, don't have it right here) the ADSC shop. Reserve Personnel Center says to go ahead and Palace Front, my (lousy) in-service recruiter said same but the AD AF sees it otherwise. That being said, if you are approved PC you can continue to serve out the VA "service commitment" for the transfer without re-starting, but they have to approve (rubber stamp) that. If someone has a silver bullet please advise, I hope I'm wrong somehow. That's what I've been told, some people along the way said otherwise (have that in writing too) but it's a case of clown-assed shoes not knowing their own regulations and policies. Wasted a lot of time trying to teach them, no joy.
Side note and further background: I was told the PC approval process involves a periodic board of 5: they all review your case and vote, majority rules. This likely explains why some packages are approved in weeks and others take months. They advertise 6-8 weeks, but my latest correspondence says 3-12 weeks. The PC office and others recommend keeping the memo away from personal sob stories and try to sell them on why the early release (STS) is good for the AD AF. Examples might include no PCS cost, going to a Guard/Reserve training billet that helps AD, etc. Be sure to include a hiring letter of intent from your gaining unit too.