Seems like it might be a way to produce some really nice hybrids. Some hybrids are already looking much better than regular CRS/CBS, so the addition of some PRL genes in the mix could liven things up.
I would not do this with a nice female PRL though, as it would be wasting an opportunity to breed more nice PRL shrimp. I'd use a low quality PRL destined for the cull tank and hope some of the good genes show up in the offspring. Or use a nice male PRL in a tank with female TBs.