yes it's a pellicle. Yes, it's totally safe. It is also likely quite taste. I have a batch pitched with, among other things, some cuvee freddy dregs and it already tastes awesome after about 5 weeks.
How did you decide it was three points from fg? Especially with mixed fermentations you can't really make a determination of what the fg 'should' be. those bugs are going to keep eating what they can until they can't.
but yeah, short answer is it's fine. It's not just lacto though. if you used the cuvee freddy it has a full compliment of bugs in there.