I'm unsure how Future would hold up Shipwreck. Certainly, a flat coat would hold up well. Typically, laquers should go down first before acrylics and not the other way around, but I've been finding out that I get away with a lot of rule breaking (or bending rather) provided certain things are happening i.e. thin coats, coats of a clear flat, etc. I recently caught a video on youtube from doog's channel....never even knew he had one =]. In the video he did some trial and error with different primer coats to see how it would affect the finish. Give it a look see and decided for yourself.
Bare Metal Variance pt 1: https://www.youtube.com/watch?v=pMjuSZdHayE
Bare Metal Variance pt 2: https://www.youtube.com/watch?v=1R8zwalD8t8&feature=iv&src_vid=_yQNHVFf0uU&annotation_id=5655f5be-0000-2d3f-b2ce-94eb2c060cc8
It all really depends on the outcome you're trying to accomplish. But it certainly seems possible. The only thing you may find is how well the laquer paint bonds to the plastic. If there's an acrylic "barrier" in between it and the plastic then you may end up with paint peeling in certain situations. Just a thought.