Yes. My DD is doing gold this year and her planned routine includes a low bar kip, squat on, high bar kip, and flyaway.. With some other stuff (casts and circling elements) in there somewhere.
Yes... I will confirm that it is allowed in Xcel Gold. Any A or B skill not specifically prohibited is allowed. Plus skills that are in the L3-L5 routines are allowed, even if not in the JO Code of Points.
(Bars: No Giants; No release moves with bar change. Floor: No B Saltos). No C skills or higher are allowed either.