There lies the crux of your dilemma. If you separated from mil in the last couple years, I think you would be okay on currency from a majors viewpoint. However, since you've been flying a 560 for 3 years, your mil recency may not apply.

The question is how long do you hold out for another 560 gig? If you can't find another 560 gig, is flying general aviation enough to remain current in a HR point of view? If not, how long do you wait in hopes of a corporate jet job versus applying at a regional?